Ubuntu 18.04: Ethernet keeps dropping randomly for several seconds Announcing the arrival of Valued Associate #679: Cesar Manara Planned maintenance scheduled April 23, 2019 at 00:00UTC (8:00pm US/Eastern)Can't connect to VPN on Ubuntu 14.04Wireless LAN worked in 14.04, doesn't on 16.04 even with the proprietary driversUbuntu 14.04 Ethernet and Wifi not working (unclaimed network)Wifi problems with HP StreamEthernet keeps connecting and droppingConnections on Ubuntu 16.04 are not working properly. WIFI is slow and rarely works. Ethernet does not connect at allNetworkManager ignoring conf files at startup but not when restartedUbuntuStudio will connect to one of two routersUbuntu 18.04 ethernet not configuring automaticallyWifi breaks all the time - Ubuntu 18.04 - [14e4:4331]

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Ubuntu 18.04: Ethernet keeps dropping randomly for several seconds



Announcing the arrival of Valued Associate #679: Cesar Manara
Planned maintenance scheduled April 23, 2019 at 00:00UTC (8:00pm US/Eastern)Can't connect to VPN on Ubuntu 14.04Wireless LAN worked in 14.04, doesn't on 16.04 even with the proprietary driversUbuntu 14.04 Ethernet and Wifi not working (unclaimed network)Wifi problems with HP StreamEthernet keeps connecting and droppingConnections on Ubuntu 16.04 are not working properly. WIFI is slow and rarely works. Ethernet does not connect at allNetworkManager ignoring conf files at startup but not when restartedUbuntuStudio will connect to one of two routersUbuntu 18.04 ethernet not configuring automaticallyWifi breaks all the time - Ubuntu 18.04 - [14e4:4331]



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0















Recently I have installed a new router because of a internet provider change and since then my previously faithful ethernet connection makes problems. Even though internet access and the network in general works, the ethernet connection fails every now and then for several seconds. It seems to happen preferably when starting large/fast downloads but will also happen while doing things not obviously network related.



Here are my hardware specs:



julian@julian-desktop:~$ lspci -nnk | grep -i net -A2
24:00.0 Network controller [0280]: Intel Corporation Dual Band Wireless-AC 3168NGW [Stone Peak] [8086:24fb] (rev 10)
 Subsystem: Intel Corporation Device [8086:2110]
 Kernel driver in use: iwlwifi
--
25:00.0 Ethernet controller [0200]: Intel Corporation I211 Gigabit Network Connection [8086:1539] (rev 03)
 Subsystem: ASRock Incorporation I211 Gigabit Network Connection [1849:1539]
 Kernel driver in use: igb
 Kernel modules: igb


And ifconfig:



julian@julian-desktop:~$ ifconfig
enp37s0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
 inet 192.168.178.42 netmask 255.255.255.0 broadcast 192.168.178.255
 inet6 fe80::4a89:a9d2:49ca:9df4 prefixlen 64 scopeid 0x20<link>
 ether 70:85:c2:a8:bb:7f txqueuelen 1000 (Ethernet)
 RX packets 333573 bytes 479511002 (479.5 MB)
 RX errors 2 dropped 0 overruns 0 frame 1
 TX packets 180965 bytes 14125591 (14.1 MB)
 TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
 device memory 0xf7500000-f751ffff 

enp3s0f0u3c4i2: flags=4099<UP,BROADCAST,MULTICAST> mtu 1500
 ether 42:33:1a:65:b8:0c txqueuelen 1000 (Ethernet)
 RX packets 0 bytes 0 (0.0 B)
 RX errors 0 dropped 0 overruns 0 frame 0
 TX packets 0 bytes 0 (0.0 B)
 TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
 inet 127.0.0.1 netmask 255.0.0.0
 inet6 ::1 prefixlen 128 scopeid 0x10<host>
 loop txqueuelen 1000 (Lokale Schleife)
 RX packets 6415 bytes 586547 (586.5 KB)
 RX errors 0 dropped 0 overruns 0 frame 0
 TX packets 6415 bytes 586547 (586.5 KB)
 TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

wlp36s0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
 inet 10.42.0.1 netmask 255.255.255.0 broadcast 10.42.0.255
 inet6 fe80::d7d4:24b5:9682:47bb prefixlen 64 scopeid 0x20<link>
 ether 3c:6a:a7:4e:40:f8 txqueuelen 1000 (Ethernet)
 RX packets 104 bytes 11975 (11.9 KB)
 RX errors 0 dropped 1 overruns 0 frame 0
 TX packets 303 bytes 47366 (47.3 KB)
 TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0


And here is the log from /var/log/syslog one of the disconnection periods:



Apr 15 17:52:46 julian-desktop kernel: [ 1657.601916] igb 0000:25:00.0 enp37s0: igb: enp37s0 NIC Link is Down
Apr 15 17:52:52 julian-desktop wpa_supplicant[1338]: message repeated 21 times: [ wlp36s0: CTRL-EVENT-SCAN-FAILED ret=-95 retry=1]
Apr 15 17:52:52 julian-desktop NetworkManager[1320]: <info> [1555343572.1914] device (enp37s0): state change: activated -> unavailable (reason 'carrier-changed', sys-iface-state: 'managed')
Apr 15 17:52:52 julian-desktop NetworkManager[1320]: <info> [1555343572.2074] dhcp4 (enp37s0): canceled DHCP transaction, DHCP client pid 4430
Apr 15 17:52:52 julian-desktop NetworkManager[1320]: <info> [1555343572.2074] dhcp4 (enp37s0): state changed bound -> done
Apr 15 17:52:52 julian-desktop avahi-daemon[1334]: Withdrawing address record for 192.168.178.42 on enp37s0.
Apr 15 17:52:52 julian-desktop avahi-daemon[1334]: Leaving mDNS multicast group on interface enp37s0.IPv4 with address 192.168.178.42.
Apr 15 17:52:52 julian-desktop avahi-daemon[1334]: Interface enp37s0.IPv4 no longer relevant for mDNS.
Apr 15 17:52:52 julian-desktop avahi-daemon[1334]: Withdrawing address record for fe80::4a89:a9d2:49ca:9df4 on enp37s0.
Apr 15 17:52:52 julian-desktop avahi-daemon[1334]: Leaving mDNS multicast group on interface enp37s0.IPv6 with address fe80::4a89:a9d2:49ca:9df4.
Apr 15 17:52:52 julian-desktop avahi-daemon[1334]: Interface enp37s0.IPv6 no longer relevant for mDNS.
Apr 15 17:52:52 julian-desktop NetworkManager[1320]: <info> [1555343572.2104] manager: NetworkManager state is now CONNECTED_SITE
Apr 15 17:52:52 julian-desktop NetworkManager[1320]: <info> [1555343572.2111] manager: NetworkManager state is now CONNECTED_LOCAL
Apr 15 17:52:52 julian-desktop dbus-daemon[1302]: [system] Activating via systemd: service name='org.freedesktop.nm_dispatcher' unit='dbus-org.freedesktop.nm-dispatcher.service' requested by ':1.13' (uid=0 pid=1320 comm="/usr/sbin/NetworkManager --no-daemon " label="unconfined")
Apr 15 17:52:52 julian-desktop whoopsie[2042]: [17:52:52] offline
Apr 15 17:52:52 julian-desktop dnsmasq[1846]: lese /etc/resolv.conf
Apr 15 17:52:52 julian-desktop dnsmasq[1846]: Benutze Namensserver 127.0.0.53#53
Apr 15 17:52:52 julian-desktop dnsmasq[1846]: Cache geleert
Apr 15 17:52:52 julian-desktop dnsmasq[1846]: lese /etc/resolv.conf
Apr 15 17:52:52 julian-desktop dnsmasq[1846]: Benutze Namensserver 127.0.0.53#53
Apr 15 17:52:52 julian-desktop dnsmasq[1846]: Cache geleert
Apr 15 17:52:52 julian-desktop dnsmasq[1846]: lese /etc/resolv.conf
Apr 15 17:52:52 julian-desktop dnsmasq[1846]: Benutze Namensserver 127.0.0.53#53
Apr 15 17:52:52 julian-desktop dnsmasq[1846]: Cache geleert
Apr 15 17:52:52 julian-desktop dnsmasq[1846]: lese /etc/resolv.conf
Apr 15 17:52:52 julian-desktop dnsmasq[1846]: Benutze Namensserver 127.0.0.53#53
Apr 15 17:52:52 julian-desktop dnsmasq[1846]: Cache geleert
Apr 15 17:52:52 julian-desktop dnsmasq[1846]: lese /etc/resolv.conf
Apr 15 17:52:52 julian-desktop dnsmasq[1846]: Benutze Namensserver 127.0.0.53#53
Apr 15 17:52:52 julian-desktop dnsmasq[1846]: Cache geleert
Apr 15 17:52:52 julian-desktop dnsmasq[1846]: lese /etc/resolv.conf
Apr 15 17:52:52 julian-desktop dnsmasq[1846]: Benutze Namensserver 127.0.0.53#53
Apr 15 17:52:52 julian-desktop dnsmasq[1846]: Cache geleert
Apr 15 17:52:52 julian-desktop dnsmasq[1846]: lese /etc/resolv.conf
Apr 15 17:52:52 julian-desktop dnsmasq[1846]: Benutze Namensserver 127.0.0.53#53
Apr 15 17:52:52 julian-desktop dnsmasq[1846]: Cache geleert
Apr 15 17:52:52 julian-desktop dnsmasq[1846]: lese /etc/resolv.conf
Apr 15 17:52:52 julian-desktop dnsmasq[1846]: Benutze Namensserver 127.0.0.53#53
Apr 15 17:52:52 julian-desktop dnsmasq[1846]: Cache geleert
Apr 15 17:52:52 julian-desktop systemd[1]: Starting Network Manager Script Dispatcher Service...
Apr 15 17:52:52 julian-desktop deja-dup-monito[3587]: Source ID 112 was not found when attempting to remove it
Apr 15 17:52:52 julian-desktop gsd-sharing[2454]: Failed to StopUnit service: GDBus.Error:org.freedesktop.systemd1.NoSuchUnit: Unit gnome-user-share-webdav.service not loaded.
Apr 15 17:52:52 julian-desktop gsd-sharing[2454]: Failed to StopUnit service: GDBus.Error:org.freedesktop.systemd1.NoSuchUnit: Unit rygel.service not loaded.
Apr 15 17:52:52 julian-desktop dbus-daemon[1302]: [system] Successfully activated service 'org.freedesktop.nm_dispatcher'
Apr 15 17:52:52 julian-desktop gsd-sharing[2454]: Failed to StopUnit service: GDBus.Error:org.freedesktop.systemd1.NoSuchUnit: Unit gnome-remote-desktop.service not loaded.
Apr 15 17:52:52 julian-desktop systemd[1]: Started Network Manager Script Dispatcher Service.
Apr 15 17:52:52 julian-desktop nm-dispatcher: req:1 'connectivity-change': new request (1 scripts)
Apr 15 17:52:52 julian-desktop nm-dispatcher: req:1 'connectivity-change': start running ordered scripts...
Apr 15 17:52:52 julian-desktop nm-dispatcher: req:2 'down' [enp37s0]: new request (1 scripts)
Apr 15 17:52:52 julian-desktop nm-dispatcher: req:2 'down' [enp37s0]: start running ordered scripts...
Apr 15 17:52:53 julian-desktop wpa_supplicant[1338]: wlp36s0: CTRL-EVENT-SCAN-FAILED ret=-95 retry=1
Apr 15 17:52:53 julian-desktop goa-daemon[2337]: goa_http_client_check() failed: 2 — Fehler beim Auflösen von »kmu.files.cnow.at«: Der Name oder der Dienst ist nicht bekannt
Apr 15 17:52:53 julian-desktop goa-daemon[2337]: /org/gnome/OnlineAccounts/Accounts/account_1547674158_0: Setting AttentionNeeded to TRUE because EnsureCredentials() failed with: Ungültiges Passwort für Benutzer »julian.fesel@inode.at« (goa-error-quark, 0): Rechnername konnte nicht aufgelöst werden (goa-error-quark, 4)
Apr 15 17:52:54 julian-desktop wpa_supplicant[1338]: wlp36s0: CTRL-EVENT-SCAN-FAILED ret=-95 retry=1
Apr 15 17:52:54 julian-desktop goa-daemon[2337]: goa_http_client_check() failed: 2 — Fehler beim Auflösen von »kmu.files.cnow.at«: Der Name oder der Dienst ist nicht bekannt
Apr 15 17:52:55 julian-desktop wpa_supplicant[1338]: wlp36s0: CTRL-EVENT-SCAN-FAILED ret=-95 retry=1
Apr 15 17:53:06 julian-desktop wpa_supplicant[1338]: message repeated 11 times: [ wlp36s0: CTRL-EVENT-SCAN-FAILED ret=-95 retry=1]
Apr 15 17:53:06 julian-desktop NetworkManager[1320]: <info> [1555343586.8275] device (enp37s0): carrier: link connected
Apr 15 17:53:06 julian-desktop NetworkManager[1320]: <info> [1555343586.8279] device (enp37s0): state change: unavailable -> disconnected (reason 'carrier-changed', sys-iface-state: 'managed')
Apr 15 17:53:06 julian-desktop NetworkManager[1320]: <info> [1555343586.8291] policy: auto-activating connection 'Kabelgebundene Verbindung 1'
Apr 15 17:53:06 julian-desktop kernel: [ 1678.238273] igb 0000:25:00.0 enp37s0: igb: enp37s0 NIC Link is Up 100 Mbps Full Duplex, Flow Control: RX/TX
Apr 15 17:53:06 julian-desktop NetworkManager[1320]: <info> [1555343586.8307] device (enp37s0): Activation: starting connection 'Kabelgebundene Verbindung 1' (599cf1b6-92de-3ca4-a47a-a9b8f9c1b24f)
Apr 15 17:53:06 julian-desktop NetworkManager[1320]: <info> [1555343586.8310] device (enp37s0): state change: disconnected -> prepare (reason 'none', sys-iface-state: 'managed')
Apr 15 17:53:06 julian-desktop NetworkManager[1320]: <info> [1555343586.8313] manager: NetworkManager state is now CONNECTING
Apr 15 17:53:06 julian-desktop NetworkManager[1320]: <info> [1555343586.8318] device (enp37s0): state change: prepare -> config (reason 'none', sys-iface-state: 'managed')
Apr 15 17:53:06 julian-desktop NetworkManager[1320]: <info> [1555343586.8325] device (enp37s0): state change: config -> ip-config (reason 'none', sys-iface-state: 'managed')
Apr 15 17:53:06 julian-desktop NetworkManager[1320]: <info> [1555343586.8329] dhcp4 (enp37s0): activation: beginning transaction (timeout in 45 seconds)
Apr 15 17:53:06 julian-desktop NetworkManager[1320]: <info> [1555343586.8347] dhcp4 (enp37s0): dhclient started with pid 4755
Apr 15 17:53:06 julian-desktop dhclient[4755]: DHCPREQUEST of 192.168.178.42 on enp37s0 to 255.255.255.255 port 67 (xid=0x6d294be5)
Apr 15 17:53:07 julian-desktop wpa_supplicant[1338]: wlp36s0: CTRL-EVENT-SCAN-FAILED ret=-95 retry=1
Apr 15 17:53:08 julian-desktop wpa_supplicant[1338]: wlp36s0: CTRL-EVENT-SCAN-FAILED ret=-95 retry=1
Apr 15 17:53:08 julian-desktop goa-daemon[2337]: goa_http_client_check() failed: 2 — Fehler beim Auflösen von »kmu.files.cnow.at«: Der Name oder der Dienst ist nicht bekannt
Apr 15 17:53:08 julian-desktop avahi-daemon[1334]: Joining mDNS multicast group on interface enp37s0.IPv6 with address fe80::4a89:a9d2:49ca:9df4.
Apr 15 17:53:08 julian-desktop avahi-daemon[1334]: New relevant interface enp37s0.IPv6 for mDNS.
Apr 15 17:53:08 julian-desktop avahi-daemon[1334]: Registering new address record for fe80::4a89:a9d2:49ca:9df4 on enp37s0.*.
Apr 15 17:53:09 julian-desktop wpa_supplicant[1338]: wlp36s0: CTRL-EVENT-SCAN-FAILED ret=-95 retry=1
Apr 15 17:53:09 julian-desktop dhclient[4755]: DHCPREQUEST of 192.168.178.42 on enp37s0 to 255.255.255.255 port 67 (xid=0x6d294be5)
Apr 15 17:53:09 julian-desktop dhclient[4755]: DHCPACK of 192.168.178.42 from 192.168.178.1
Apr 15 17:53:09 julian-desktop NetworkManager[1320]: <info> [1555343589.1435] dhcp4 (enp37s0): address 192.168.178.42
Apr 15 17:53:09 julian-desktop NetworkManager[1320]: <info> [1555343589.1435] dhcp4 (enp37s0): plen 24 (255.255.255.0)
Apr 15 17:53:09 julian-desktop NetworkManager[1320]: <info> [1555343589.1435] dhcp4 (enp37s0): gateway 192.168.178.1
Apr 15 17:53:09 julian-desktop NetworkManager[1320]: <info> [1555343589.1435] dhcp4 (enp37s0): lease time 864000
Apr 15 17:53:09 julian-desktop NetworkManager[1320]: <info> [1555343589.1435] dhcp4 (enp37s0): nameserver '192.168.178.1'
Apr 15 17:53:09 julian-desktop NetworkManager[1320]: <info> [1555343589.1435] dhcp4 (enp37s0): domain name 'fritz.box'
Apr 15 17:53:09 julian-desktop NetworkManager[1320]: <info> [1555343589.1436] dhcp4 (enp37s0): state changed unknown -> bound
Apr 15 17:53:09 julian-desktop avahi-daemon[1334]: Joining mDNS multicast group on interface enp37s0.IPv4 with address 192.168.178.42.
Apr 15 17:53:09 julian-desktop avahi-daemon[1334]: New relevant interface enp37s0.IPv4 for mDNS.
Apr 15 17:53:09 julian-desktop avahi-daemon[1334]: Registering new address record for 192.168.178.42 on enp37s0.IPv4.
Apr 15 17:53:09 julian-desktop NetworkManager[1320]: <info> [1555343589.1456] device (enp37s0): state change: ip-config -> ip-check (reason 'none', sys-iface-state: 'managed')
Apr 15 17:53:09 julian-desktop dhclient[4755]: bound to 192.168.178.42 -- renewal in 360679 seconds.
Apr 15 17:53:09 julian-desktop whoopsie[2042]: [17:53:09] Cannot reach: https://daisy.ubuntu.com
Apr 15 17:53:09 julian-desktop NetworkManager[1320]: <info> [1555343589.1466] device (enp37s0): state change: ip-check -> secondaries (reason 'none', sys-iface-state: 'managed')
Apr 15 17:53:09 julian-desktop NetworkManager[1320]: <info> [1555343589.1469] device (enp37s0): state change: secondaries -> activated (reason 'none', sys-iface-state: 'managed')
Apr 15 17:53:09 julian-desktop NetworkManager[1320]: <info> [1555343589.1471] manager: NetworkManager state is now CONNECTED_LOCAL
Apr 15 17:53:09 julian-desktop NetworkManager[1320]: <info> [1555343589.1487] manager: NetworkManager state is now CONNECTED_SITE
Apr 15 17:53:09 julian-desktop NetworkManager[1320]: <info> [1555343589.1488] policy: set 'Kabelgebundene Verbindung 1' (enp37s0) as default for IPv4 routing and DNS
Apr 15 17:53:09 julian-desktop NetworkManager[1320]: <info> [1555343589.1492] device (enp37s0): Activation: successful, device activated.
Apr 15 17:53:09 julian-desktop dnsmasq[1846]: lese /etc/resolv.conf
Apr 15 17:53:09 julian-desktop dnsmasq[1846]: Benutze Namensserver 127.0.0.53#53
Apr 15 17:53:09 julian-desktop dnsmasq[1846]: Cache geleert
Apr 15 17:53:09 julian-desktop dnsmasq[1846]: lese /etc/resolv.conf
Apr 15 17:53:09 julian-desktop dnsmasq[1846]: Benutze Namensserver 127.0.0.53#53
Apr 15 17:53:09 julian-desktop dnsmasq[1846]: Cache geleert
Apr 15 17:53:09 julian-desktop dnsmasq[1846]: lese /etc/resolv.conf
Apr 15 17:53:09 julian-desktop dnsmasq[1846]: Benutze Namensserver 127.0.0.53#53
Apr 15 17:53:09 julian-desktop dnsmasq[1846]: Cache geleert
Apr 15 17:53:09 julian-desktop dbus-daemon[1302]: [system] Activating via systemd: service name='org.freedesktop.nm_dispatcher' unit='dbus-org.freedesktop.nm-dispatcher.service' requested by ':1.13' (uid=0 pid=1320 comm="/usr/sbin/NetworkManager --no-daemon " label="unconfined")
Apr 15 17:53:09 julian-desktop dnsmasq[1846]: lese /etc/resolv.conf
Apr 15 17:53:09 julian-desktop dnsmasq[1846]: Benutze Namensserver 127.0.0.53#53
Apr 15 17:53:09 julian-desktop dnsmasq[1846]: Cache geleert
Apr 15 17:53:09 julian-desktop dnsmasq[1846]: lese /etc/resolv.conf
Apr 15 17:53:09 julian-desktop dnsmasq[1846]: Benutze Namensserver 127.0.0.53#53
Apr 15 17:53:09 julian-desktop dnsmasq[1846]: Cache geleert


I am fairly certain that the problem is ubuntu/pc related and that connection cable and router are fine. I tried using the same cable connection with another computer and there I don't experiance any problems. I also already updated the system but it makes no difference.



I am not really a ubuntu superuser and kind of at a loss on how to solve/start solving this issue (with the exception of drastic measures like reinstalling the system).
Please let me know if I can provide any additional info.






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    Recently I have installed a new router because of a internet provider change and since then my previously faithful ethernet connection makes problems. Even though internet access and the network in general works, the ethernet connection fails every now and then for several seconds. It seems to happen preferably when starting large/fast downloads but will also happen while doing things not obviously network related.



    Here are my hardware specs:



    julian@julian-desktop:~$ lspci -nnk | grep -i net -A2
    24:00.0 Network controller [0280]: Intel Corporation Dual Band Wireless-AC 3168NGW [Stone Peak] [8086:24fb] (rev 10)
     Subsystem: Intel Corporation Device [8086:2110]
     Kernel driver in use: iwlwifi
    --
    25:00.0 Ethernet controller [0200]: Intel Corporation I211 Gigabit Network Connection [8086:1539] (rev 03)
     Subsystem: ASRock Incorporation I211 Gigabit Network Connection [1849:1539]
     Kernel driver in use: igb
     Kernel modules: igb


    And ifconfig:



    julian@julian-desktop:~$ ifconfig
    enp37s0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
     inet 192.168.178.42 netmask 255.255.255.0 broadcast 192.168.178.255
     inet6 fe80::4a89:a9d2:49ca:9df4 prefixlen 64 scopeid 0x20<link>
     ether 70:85:c2:a8:bb:7f txqueuelen 1000 (Ethernet)
     RX packets 333573 bytes 479511002 (479.5 MB)
     RX errors 2 dropped 0 overruns 0 frame 1
     TX packets 180965 bytes 14125591 (14.1 MB)
     TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
     device memory 0xf7500000-f751ffff 

    enp3s0f0u3c4i2: flags=4099<UP,BROADCAST,MULTICAST> mtu 1500
     ether 42:33:1a:65:b8:0c txqueuelen 1000 (Ethernet)
     RX packets 0 bytes 0 (0.0 B)
     RX errors 0 dropped 0 overruns 0 frame 0
     TX packets 0 bytes 0 (0.0 B)
     TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

    lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
     inet 127.0.0.1 netmask 255.0.0.0
     inet6 ::1 prefixlen 128 scopeid 0x10<host>
     loop txqueuelen 1000 (Lokale Schleife)
     RX packets 6415 bytes 586547 (586.5 KB)
     RX errors 0 dropped 0 overruns 0 frame 0
     TX packets 6415 bytes 586547 (586.5 KB)
     TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

    wlp36s0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
     inet 10.42.0.1 netmask 255.255.255.0 broadcast 10.42.0.255
     inet6 fe80::d7d4:24b5:9682:47bb prefixlen 64 scopeid 0x20<link>
     ether 3c:6a:a7:4e:40:f8 txqueuelen 1000 (Ethernet)
     RX packets 104 bytes 11975 (11.9 KB)
     RX errors 0 dropped 1 overruns 0 frame 0
     TX packets 303 bytes 47366 (47.3 KB)
     TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0


    And here is the log from /var/log/syslog one of the disconnection periods:



    Apr 15 17:52:46 julian-desktop kernel: [ 1657.601916] igb 0000:25:00.0 enp37s0: igb: enp37s0 NIC Link is Down
    Apr 15 17:52:52 julian-desktop wpa_supplicant[1338]: message repeated 21 times: [ wlp36s0: CTRL-EVENT-SCAN-FAILED ret=-95 retry=1]
    Apr 15 17:52:52 julian-desktop NetworkManager[1320]: <info> [1555343572.1914] device (enp37s0): state change: activated -> unavailable (reason 'carrier-changed', sys-iface-state: 'managed')
    Apr 15 17:52:52 julian-desktop NetworkManager[1320]: <info> [1555343572.2074] dhcp4 (enp37s0): canceled DHCP transaction, DHCP client pid 4430
    Apr 15 17:52:52 julian-desktop NetworkManager[1320]: <info> [1555343572.2074] dhcp4 (enp37s0): state changed bound -> done
    Apr 15 17:52:52 julian-desktop avahi-daemon[1334]: Withdrawing address record for 192.168.178.42 on enp37s0.
    Apr 15 17:52:52 julian-desktop avahi-daemon[1334]: Leaving mDNS multicast group on interface enp37s0.IPv4 with address 192.168.178.42.
    Apr 15 17:52:52 julian-desktop avahi-daemon[1334]: Interface enp37s0.IPv4 no longer relevant for mDNS.
    Apr 15 17:52:52 julian-desktop avahi-daemon[1334]: Withdrawing address record for fe80::4a89:a9d2:49ca:9df4 on enp37s0.
    Apr 15 17:52:52 julian-desktop avahi-daemon[1334]: Leaving mDNS multicast group on interface enp37s0.IPv6 with address fe80::4a89:a9d2:49ca:9df4.
    Apr 15 17:52:52 julian-desktop avahi-daemon[1334]: Interface enp37s0.IPv6 no longer relevant for mDNS.
    Apr 15 17:52:52 julian-desktop NetworkManager[1320]: <info> [1555343572.2104] manager: NetworkManager state is now CONNECTED_SITE
    Apr 15 17:52:52 julian-desktop NetworkManager[1320]: <info> [1555343572.2111] manager: NetworkManager state is now CONNECTED_LOCAL
    Apr 15 17:52:52 julian-desktop dbus-daemon[1302]: [system] Activating via systemd: service name='org.freedesktop.nm_dispatcher' unit='dbus-org.freedesktop.nm-dispatcher.service' requested by ':1.13' (uid=0 pid=1320 comm="/usr/sbin/NetworkManager --no-daemon " label="unconfined")
    Apr 15 17:52:52 julian-desktop whoopsie[2042]: [17:52:52] offline
    Apr 15 17:52:52 julian-desktop dnsmasq[1846]: lese /etc/resolv.conf
    Apr 15 17:52:52 julian-desktop dnsmasq[1846]: Benutze Namensserver 127.0.0.53#53
    Apr 15 17:52:52 julian-desktop dnsmasq[1846]: Cache geleert
    Apr 15 17:52:52 julian-desktop dnsmasq[1846]: lese /etc/resolv.conf
    Apr 15 17:52:52 julian-desktop dnsmasq[1846]: Benutze Namensserver 127.0.0.53#53
    Apr 15 17:52:52 julian-desktop dnsmasq[1846]: Cache geleert
    Apr 15 17:52:52 julian-desktop dnsmasq[1846]: lese /etc/resolv.conf
    Apr 15 17:52:52 julian-desktop dnsmasq[1846]: Benutze Namensserver 127.0.0.53#53
    Apr 15 17:52:52 julian-desktop dnsmasq[1846]: Cache geleert
    Apr 15 17:52:52 julian-desktop dnsmasq[1846]: lese /etc/resolv.conf
    Apr 15 17:52:52 julian-desktop dnsmasq[1846]: Benutze Namensserver 127.0.0.53#53
    Apr 15 17:52:52 julian-desktop dnsmasq[1846]: Cache geleert
    Apr 15 17:52:52 julian-desktop dnsmasq[1846]: lese /etc/resolv.conf
    Apr 15 17:52:52 julian-desktop dnsmasq[1846]: Benutze Namensserver 127.0.0.53#53
    Apr 15 17:52:52 julian-desktop dnsmasq[1846]: Cache geleert
    Apr 15 17:52:52 julian-desktop dnsmasq[1846]: lese /etc/resolv.conf
    Apr 15 17:52:52 julian-desktop dnsmasq[1846]: Benutze Namensserver 127.0.0.53#53
    Apr 15 17:52:52 julian-desktop dnsmasq[1846]: Cache geleert
    Apr 15 17:52:52 julian-desktop dnsmasq[1846]: lese /etc/resolv.conf
    Apr 15 17:52:52 julian-desktop dnsmasq[1846]: Benutze Namensserver 127.0.0.53#53
    Apr 15 17:52:52 julian-desktop dnsmasq[1846]: Cache geleert
    Apr 15 17:52:52 julian-desktop dnsmasq[1846]: lese /etc/resolv.conf
    Apr 15 17:52:52 julian-desktop dnsmasq[1846]: Benutze Namensserver 127.0.0.53#53
    Apr 15 17:52:52 julian-desktop dnsmasq[1846]: Cache geleert
    Apr 15 17:52:52 julian-desktop systemd[1]: Starting Network Manager Script Dispatcher Service...
    Apr 15 17:52:52 julian-desktop deja-dup-monito[3587]: Source ID 112 was not found when attempting to remove it
    Apr 15 17:52:52 julian-desktop gsd-sharing[2454]: Failed to StopUnit service: GDBus.Error:org.freedesktop.systemd1.NoSuchUnit: Unit gnome-user-share-webdav.service not loaded.
    Apr 15 17:52:52 julian-desktop gsd-sharing[2454]: Failed to StopUnit service: GDBus.Error:org.freedesktop.systemd1.NoSuchUnit: Unit rygel.service not loaded.
    Apr 15 17:52:52 julian-desktop dbus-daemon[1302]: [system] Successfully activated service 'org.freedesktop.nm_dispatcher'
    Apr 15 17:52:52 julian-desktop gsd-sharing[2454]: Failed to StopUnit service: GDBus.Error:org.freedesktop.systemd1.NoSuchUnit: Unit gnome-remote-desktop.service not loaded.
    Apr 15 17:52:52 julian-desktop systemd[1]: Started Network Manager Script Dispatcher Service.
    Apr 15 17:52:52 julian-desktop nm-dispatcher: req:1 'connectivity-change': new request (1 scripts)
    Apr 15 17:52:52 julian-desktop nm-dispatcher: req:1 'connectivity-change': start running ordered scripts...
    Apr 15 17:52:52 julian-desktop nm-dispatcher: req:2 'down' [enp37s0]: new request (1 scripts)
    Apr 15 17:52:52 julian-desktop nm-dispatcher: req:2 'down' [enp37s0]: start running ordered scripts...
    Apr 15 17:52:53 julian-desktop wpa_supplicant[1338]: wlp36s0: CTRL-EVENT-SCAN-FAILED ret=-95 retry=1
    Apr 15 17:52:53 julian-desktop goa-daemon[2337]: goa_http_client_check() failed: 2 — Fehler beim Auflösen von »kmu.files.cnow.at«: Der Name oder der Dienst ist nicht bekannt
    Apr 15 17:52:53 julian-desktop goa-daemon[2337]: /org/gnome/OnlineAccounts/Accounts/account_1547674158_0: Setting AttentionNeeded to TRUE because EnsureCredentials() failed with: Ungültiges Passwort für Benutzer »julian.fesel@inode.at« (goa-error-quark, 0): Rechnername konnte nicht aufgelöst werden (goa-error-quark, 4)
    Apr 15 17:52:54 julian-desktop wpa_supplicant[1338]: wlp36s0: CTRL-EVENT-SCAN-FAILED ret=-95 retry=1
    Apr 15 17:52:54 julian-desktop goa-daemon[2337]: goa_http_client_check() failed: 2 — Fehler beim Auflösen von »kmu.files.cnow.at«: Der Name oder der Dienst ist nicht bekannt
    Apr 15 17:52:55 julian-desktop wpa_supplicant[1338]: wlp36s0: CTRL-EVENT-SCAN-FAILED ret=-95 retry=1
    Apr 15 17:53:06 julian-desktop wpa_supplicant[1338]: message repeated 11 times: [ wlp36s0: CTRL-EVENT-SCAN-FAILED ret=-95 retry=1]
    Apr 15 17:53:06 julian-desktop NetworkManager[1320]: <info> [1555343586.8275] device (enp37s0): carrier: link connected
    Apr 15 17:53:06 julian-desktop NetworkManager[1320]: <info> [1555343586.8279] device (enp37s0): state change: unavailable -> disconnected (reason 'carrier-changed', sys-iface-state: 'managed')
    Apr 15 17:53:06 julian-desktop NetworkManager[1320]: <info> [1555343586.8291] policy: auto-activating connection 'Kabelgebundene Verbindung 1'
    Apr 15 17:53:06 julian-desktop kernel: [ 1678.238273] igb 0000:25:00.0 enp37s0: igb: enp37s0 NIC Link is Up 100 Mbps Full Duplex, Flow Control: RX/TX
    Apr 15 17:53:06 julian-desktop NetworkManager[1320]: <info> [1555343586.8307] device (enp37s0): Activation: starting connection 'Kabelgebundene Verbindung 1' (599cf1b6-92de-3ca4-a47a-a9b8f9c1b24f)
    Apr 15 17:53:06 julian-desktop NetworkManager[1320]: <info> [1555343586.8310] device (enp37s0): state change: disconnected -> prepare (reason 'none', sys-iface-state: 'managed')
    Apr 15 17:53:06 julian-desktop NetworkManager[1320]: <info> [1555343586.8313] manager: NetworkManager state is now CONNECTING
    Apr 15 17:53:06 julian-desktop NetworkManager[1320]: <info> [1555343586.8318] device (enp37s0): state change: prepare -> config (reason 'none', sys-iface-state: 'managed')
    Apr 15 17:53:06 julian-desktop NetworkManager[1320]: <info> [1555343586.8325] device (enp37s0): state change: config -> ip-config (reason 'none', sys-iface-state: 'managed')
    Apr 15 17:53:06 julian-desktop NetworkManager[1320]: <info> [1555343586.8329] dhcp4 (enp37s0): activation: beginning transaction (timeout in 45 seconds)
    Apr 15 17:53:06 julian-desktop NetworkManager[1320]: <info> [1555343586.8347] dhcp4 (enp37s0): dhclient started with pid 4755
    Apr 15 17:53:06 julian-desktop dhclient[4755]: DHCPREQUEST of 192.168.178.42 on enp37s0 to 255.255.255.255 port 67 (xid=0x6d294be5)
    Apr 15 17:53:07 julian-desktop wpa_supplicant[1338]: wlp36s0: CTRL-EVENT-SCAN-FAILED ret=-95 retry=1
    Apr 15 17:53:08 julian-desktop wpa_supplicant[1338]: wlp36s0: CTRL-EVENT-SCAN-FAILED ret=-95 retry=1
    Apr 15 17:53:08 julian-desktop goa-daemon[2337]: goa_http_client_check() failed: 2 — Fehler beim Auflösen von »kmu.files.cnow.at«: Der Name oder der Dienst ist nicht bekannt
    Apr 15 17:53:08 julian-desktop avahi-daemon[1334]: Joining mDNS multicast group on interface enp37s0.IPv6 with address fe80::4a89:a9d2:49ca:9df4.
    Apr 15 17:53:08 julian-desktop avahi-daemon[1334]: New relevant interface enp37s0.IPv6 for mDNS.
    Apr 15 17:53:08 julian-desktop avahi-daemon[1334]: Registering new address record for fe80::4a89:a9d2:49ca:9df4 on enp37s0.*.
    Apr 15 17:53:09 julian-desktop wpa_supplicant[1338]: wlp36s0: CTRL-EVENT-SCAN-FAILED ret=-95 retry=1
    Apr 15 17:53:09 julian-desktop dhclient[4755]: DHCPREQUEST of 192.168.178.42 on enp37s0 to 255.255.255.255 port 67 (xid=0x6d294be5)
    Apr 15 17:53:09 julian-desktop dhclient[4755]: DHCPACK of 192.168.178.42 from 192.168.178.1
    Apr 15 17:53:09 julian-desktop NetworkManager[1320]: <info> [1555343589.1435] dhcp4 (enp37s0): address 192.168.178.42
    Apr 15 17:53:09 julian-desktop NetworkManager[1320]: <info> [1555343589.1435] dhcp4 (enp37s0): plen 24 (255.255.255.0)
    Apr 15 17:53:09 julian-desktop NetworkManager[1320]: <info> [1555343589.1435] dhcp4 (enp37s0): gateway 192.168.178.1
    Apr 15 17:53:09 julian-desktop NetworkManager[1320]: <info> [1555343589.1435] dhcp4 (enp37s0): lease time 864000
    Apr 15 17:53:09 julian-desktop NetworkManager[1320]: <info> [1555343589.1435] dhcp4 (enp37s0): nameserver '192.168.178.1'
    Apr 15 17:53:09 julian-desktop NetworkManager[1320]: <info> [1555343589.1435] dhcp4 (enp37s0): domain name 'fritz.box'
    Apr 15 17:53:09 julian-desktop NetworkManager[1320]: <info> [1555343589.1436] dhcp4 (enp37s0): state changed unknown -> bound
    Apr 15 17:53:09 julian-desktop avahi-daemon[1334]: Joining mDNS multicast group on interface enp37s0.IPv4 with address 192.168.178.42.
    Apr 15 17:53:09 julian-desktop avahi-daemon[1334]: New relevant interface enp37s0.IPv4 for mDNS.
    Apr 15 17:53:09 julian-desktop avahi-daemon[1334]: Registering new address record for 192.168.178.42 on enp37s0.IPv4.
    Apr 15 17:53:09 julian-desktop NetworkManager[1320]: <info> [1555343589.1456] device (enp37s0): state change: ip-config -> ip-check (reason 'none', sys-iface-state: 'managed')
    Apr 15 17:53:09 julian-desktop dhclient[4755]: bound to 192.168.178.42 -- renewal in 360679 seconds.
    Apr 15 17:53:09 julian-desktop whoopsie[2042]: [17:53:09] Cannot reach: https://daisy.ubuntu.com
    Apr 15 17:53:09 julian-desktop NetworkManager[1320]: <info> [1555343589.1466] device (enp37s0): state change: ip-check -> secondaries (reason 'none', sys-iface-state: 'managed')
    Apr 15 17:53:09 julian-desktop NetworkManager[1320]: <info> [1555343589.1469] device (enp37s0): state change: secondaries -> activated (reason 'none', sys-iface-state: 'managed')
    Apr 15 17:53:09 julian-desktop NetworkManager[1320]: <info> [1555343589.1471] manager: NetworkManager state is now CONNECTED_LOCAL
    Apr 15 17:53:09 julian-desktop NetworkManager[1320]: <info> [1555343589.1487] manager: NetworkManager state is now CONNECTED_SITE
    Apr 15 17:53:09 julian-desktop NetworkManager[1320]: <info> [1555343589.1488] policy: set 'Kabelgebundene Verbindung 1' (enp37s0) as default for IPv4 routing and DNS
    Apr 15 17:53:09 julian-desktop NetworkManager[1320]: <info> [1555343589.1492] device (enp37s0): Activation: successful, device activated.
    Apr 15 17:53:09 julian-desktop dnsmasq[1846]: lese /etc/resolv.conf
    Apr 15 17:53:09 julian-desktop dnsmasq[1846]: Benutze Namensserver 127.0.0.53#53
    Apr 15 17:53:09 julian-desktop dnsmasq[1846]: Cache geleert
    Apr 15 17:53:09 julian-desktop dnsmasq[1846]: lese /etc/resolv.conf
    Apr 15 17:53:09 julian-desktop dnsmasq[1846]: Benutze Namensserver 127.0.0.53#53
    Apr 15 17:53:09 julian-desktop dnsmasq[1846]: Cache geleert
    Apr 15 17:53:09 julian-desktop dnsmasq[1846]: lese /etc/resolv.conf
    Apr 15 17:53:09 julian-desktop dnsmasq[1846]: Benutze Namensserver 127.0.0.53#53
    Apr 15 17:53:09 julian-desktop dnsmasq[1846]: Cache geleert
    Apr 15 17:53:09 julian-desktop dbus-daemon[1302]: [system] Activating via systemd: service name='org.freedesktop.nm_dispatcher' unit='dbus-org.freedesktop.nm-dispatcher.service' requested by ':1.13' (uid=0 pid=1320 comm="/usr/sbin/NetworkManager --no-daemon " label="unconfined")
    Apr 15 17:53:09 julian-desktop dnsmasq[1846]: lese /etc/resolv.conf
    Apr 15 17:53:09 julian-desktop dnsmasq[1846]: Benutze Namensserver 127.0.0.53#53
    Apr 15 17:53:09 julian-desktop dnsmasq[1846]: Cache geleert
    Apr 15 17:53:09 julian-desktop dnsmasq[1846]: lese /etc/resolv.conf
    Apr 15 17:53:09 julian-desktop dnsmasq[1846]: Benutze Namensserver 127.0.0.53#53
    Apr 15 17:53:09 julian-desktop dnsmasq[1846]: Cache geleert


    I am fairly certain that the problem is ubuntu/pc related and that connection cable and router are fine. I tried using the same cable connection with another computer and there I don't experiance any problems. I also already updated the system but it makes no difference.



    I am not really a ubuntu superuser and kind of at a loss on how to solve/start solving this issue (with the exception of drastic measures like reinstalling the system).
    Please let me know if I can provide any additional info.






    networking 18.04 ethernet







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      Recently I have installed a new router because of a internet provider change and since then my previously faithful ethernet connection makes problems. Even though internet access and the network in general works, the ethernet connection fails every now and then for several seconds. It seems to happen preferably when starting large/fast downloads but will also happen while doing things not obviously network related.



      Here are my hardware specs:



      julian@julian-desktop:~$ lspci -nnk | grep -i net -A2
      24:00.0 Network controller [0280]: Intel Corporation Dual Band Wireless-AC 3168NGW [Stone Peak] [8086:24fb] (rev 10)
       Subsystem: Intel Corporation Device [8086:2110]
       Kernel driver in use: iwlwifi
      --
      25:00.0 Ethernet controller [0200]: Intel Corporation I211 Gigabit Network Connection [8086:1539] (rev 03)
       Subsystem: ASRock Incorporation I211 Gigabit Network Connection [1849:1539]
       Kernel driver in use: igb
       Kernel modules: igb


      And ifconfig:



      julian@julian-desktop:~$ ifconfig
      enp37s0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
       inet 192.168.178.42 netmask 255.255.255.0 broadcast 192.168.178.255
       inet6 fe80::4a89:a9d2:49ca:9df4 prefixlen 64 scopeid 0x20<link>
       ether 70:85:c2:a8:bb:7f txqueuelen 1000 (Ethernet)
       RX packets 333573 bytes 479511002 (479.5 MB)
       RX errors 2 dropped 0 overruns 0 frame 1
       TX packets 180965 bytes 14125591 (14.1 MB)
       TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
       device memory 0xf7500000-f751ffff 

      enp3s0f0u3c4i2: flags=4099<UP,BROADCAST,MULTICAST> mtu 1500
       ether 42:33:1a:65:b8:0c txqueuelen 1000 (Ethernet)
       RX packets 0 bytes 0 (0.0 B)
       RX errors 0 dropped 0 overruns 0 frame 0
       TX packets 0 bytes 0 (0.0 B)
       TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

      lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
       inet 127.0.0.1 netmask 255.0.0.0
       inet6 ::1 prefixlen 128 scopeid 0x10<host>
       loop txqueuelen 1000 (Lokale Schleife)
       RX packets 6415 bytes 586547 (586.5 KB)
       RX errors 0 dropped 0 overruns 0 frame 0
       TX packets 6415 bytes 586547 (586.5 KB)
       TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

      wlp36s0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
       inet 10.42.0.1 netmask 255.255.255.0 broadcast 10.42.0.255
       inet6 fe80::d7d4:24b5:9682:47bb prefixlen 64 scopeid 0x20<link>
       ether 3c:6a:a7:4e:40:f8 txqueuelen 1000 (Ethernet)
       RX packets 104 bytes 11975 (11.9 KB)
       RX errors 0 dropped 1 overruns 0 frame 0
       TX packets 303 bytes 47366 (47.3 KB)
       TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0


      And here is the log from /var/log/syslog one of the disconnection periods:



      Apr 15 17:52:46 julian-desktop kernel: [ 1657.601916] igb 0000:25:00.0 enp37s0: igb: enp37s0 NIC Link is Down
      Apr 15 17:52:52 julian-desktop wpa_supplicant[1338]: message repeated 21 times: [ wlp36s0: CTRL-EVENT-SCAN-FAILED ret=-95 retry=1]
      Apr 15 17:52:52 julian-desktop NetworkManager[1320]: <info> [1555343572.1914] device (enp37s0): state change: activated -> unavailable (reason 'carrier-changed', sys-iface-state: 'managed')
      Apr 15 17:52:52 julian-desktop NetworkManager[1320]: <info> [1555343572.2074] dhcp4 (enp37s0): canceled DHCP transaction, DHCP client pid 4430
      Apr 15 17:52:52 julian-desktop NetworkManager[1320]: <info> [1555343572.2074] dhcp4 (enp37s0): state changed bound -> done
      Apr 15 17:52:52 julian-desktop avahi-daemon[1334]: Withdrawing address record for 192.168.178.42 on enp37s0.
      Apr 15 17:52:52 julian-desktop avahi-daemon[1334]: Leaving mDNS multicast group on interface enp37s0.IPv4 with address 192.168.178.42.
      Apr 15 17:52:52 julian-desktop avahi-daemon[1334]: Interface enp37s0.IPv4 no longer relevant for mDNS.
      Apr 15 17:52:52 julian-desktop avahi-daemon[1334]: Withdrawing address record for fe80::4a89:a9d2:49ca:9df4 on enp37s0.
      Apr 15 17:52:52 julian-desktop avahi-daemon[1334]: Leaving mDNS multicast group on interface enp37s0.IPv6 with address fe80::4a89:a9d2:49ca:9df4.
      Apr 15 17:52:52 julian-desktop avahi-daemon[1334]: Interface enp37s0.IPv6 no longer relevant for mDNS.
      Apr 15 17:52:52 julian-desktop NetworkManager[1320]: <info> [1555343572.2104] manager: NetworkManager state is now CONNECTED_SITE
      Apr 15 17:52:52 julian-desktop NetworkManager[1320]: <info> [1555343572.2111] manager: NetworkManager state is now CONNECTED_LOCAL
      Apr 15 17:52:52 julian-desktop dbus-daemon[1302]: [system] Activating via systemd: service name='org.freedesktop.nm_dispatcher' unit='dbus-org.freedesktop.nm-dispatcher.service' requested by ':1.13' (uid=0 pid=1320 comm="/usr/sbin/NetworkManager --no-daemon " label="unconfined")
      Apr 15 17:52:52 julian-desktop whoopsie[2042]: [17:52:52] offline
      Apr 15 17:52:52 julian-desktop dnsmasq[1846]: lese /etc/resolv.conf
      Apr 15 17:52:52 julian-desktop dnsmasq[1846]: Benutze Namensserver 127.0.0.53#53
      Apr 15 17:52:52 julian-desktop dnsmasq[1846]: Cache geleert
      Apr 15 17:52:52 julian-desktop dnsmasq[1846]: lese /etc/resolv.conf
      Apr 15 17:52:52 julian-desktop dnsmasq[1846]: Benutze Namensserver 127.0.0.53#53
      Apr 15 17:52:52 julian-desktop dnsmasq[1846]: Cache geleert
      Apr 15 17:52:52 julian-desktop dnsmasq[1846]: lese /etc/resolv.conf
      Apr 15 17:52:52 julian-desktop dnsmasq[1846]: Benutze Namensserver 127.0.0.53#53
      Apr 15 17:52:52 julian-desktop dnsmasq[1846]: Cache geleert
      Apr 15 17:52:52 julian-desktop dnsmasq[1846]: lese /etc/resolv.conf
      Apr 15 17:52:52 julian-desktop dnsmasq[1846]: Benutze Namensserver 127.0.0.53#53
      Apr 15 17:52:52 julian-desktop dnsmasq[1846]: Cache geleert
      Apr 15 17:52:52 julian-desktop dnsmasq[1846]: lese /etc/resolv.conf
      Apr 15 17:52:52 julian-desktop dnsmasq[1846]: Benutze Namensserver 127.0.0.53#53
      Apr 15 17:52:52 julian-desktop dnsmasq[1846]: Cache geleert
      Apr 15 17:52:52 julian-desktop dnsmasq[1846]: lese /etc/resolv.conf
      Apr 15 17:52:52 julian-desktop dnsmasq[1846]: Benutze Namensserver 127.0.0.53#53
      Apr 15 17:52:52 julian-desktop dnsmasq[1846]: Cache geleert
      Apr 15 17:52:52 julian-desktop dnsmasq[1846]: lese /etc/resolv.conf
      Apr 15 17:52:52 julian-desktop dnsmasq[1846]: Benutze Namensserver 127.0.0.53#53
      Apr 15 17:52:52 julian-desktop dnsmasq[1846]: Cache geleert
      Apr 15 17:52:52 julian-desktop dnsmasq[1846]: lese /etc/resolv.conf
      Apr 15 17:52:52 julian-desktop dnsmasq[1846]: Benutze Namensserver 127.0.0.53#53
      Apr 15 17:52:52 julian-desktop dnsmasq[1846]: Cache geleert
      Apr 15 17:52:52 julian-desktop systemd[1]: Starting Network Manager Script Dispatcher Service...
      Apr 15 17:52:52 julian-desktop deja-dup-monito[3587]: Source ID 112 was not found when attempting to remove it
      Apr 15 17:52:52 julian-desktop gsd-sharing[2454]: Failed to StopUnit service: GDBus.Error:org.freedesktop.systemd1.NoSuchUnit: Unit gnome-user-share-webdav.service not loaded.
      Apr 15 17:52:52 julian-desktop gsd-sharing[2454]: Failed to StopUnit service: GDBus.Error:org.freedesktop.systemd1.NoSuchUnit: Unit rygel.service not loaded.
      Apr 15 17:52:52 julian-desktop dbus-daemon[1302]: [system] Successfully activated service 'org.freedesktop.nm_dispatcher'
      Apr 15 17:52:52 julian-desktop gsd-sharing[2454]: Failed to StopUnit service: GDBus.Error:org.freedesktop.systemd1.NoSuchUnit: Unit gnome-remote-desktop.service not loaded.
      Apr 15 17:52:52 julian-desktop systemd[1]: Started Network Manager Script Dispatcher Service.
      Apr 15 17:52:52 julian-desktop nm-dispatcher: req:1 'connectivity-change': new request (1 scripts)
      Apr 15 17:52:52 julian-desktop nm-dispatcher: req:1 'connectivity-change': start running ordered scripts...
      Apr 15 17:52:52 julian-desktop nm-dispatcher: req:2 'down' [enp37s0]: new request (1 scripts)
      Apr 15 17:52:52 julian-desktop nm-dispatcher: req:2 'down' [enp37s0]: start running ordered scripts...
      Apr 15 17:52:53 julian-desktop wpa_supplicant[1338]: wlp36s0: CTRL-EVENT-SCAN-FAILED ret=-95 retry=1
      Apr 15 17:52:53 julian-desktop goa-daemon[2337]: goa_http_client_check() failed: 2 — Fehler beim Auflösen von »kmu.files.cnow.at«: Der Name oder der Dienst ist nicht bekannt
      Apr 15 17:52:53 julian-desktop goa-daemon[2337]: /org/gnome/OnlineAccounts/Accounts/account_1547674158_0: Setting AttentionNeeded to TRUE because EnsureCredentials() failed with: Ungültiges Passwort für Benutzer »julian.fesel@inode.at« (goa-error-quark, 0): Rechnername konnte nicht aufgelöst werden (goa-error-quark, 4)
      Apr 15 17:52:54 julian-desktop wpa_supplicant[1338]: wlp36s0: CTRL-EVENT-SCAN-FAILED ret=-95 retry=1
      Apr 15 17:52:54 julian-desktop goa-daemon[2337]: goa_http_client_check() failed: 2 — Fehler beim Auflösen von »kmu.files.cnow.at«: Der Name oder der Dienst ist nicht bekannt
      Apr 15 17:52:55 julian-desktop wpa_supplicant[1338]: wlp36s0: CTRL-EVENT-SCAN-FAILED ret=-95 retry=1
      Apr 15 17:53:06 julian-desktop wpa_supplicant[1338]: message repeated 11 times: [ wlp36s0: CTRL-EVENT-SCAN-FAILED ret=-95 retry=1]
      Apr 15 17:53:06 julian-desktop NetworkManager[1320]: <info> [1555343586.8275] device (enp37s0): carrier: link connected
      Apr 15 17:53:06 julian-desktop NetworkManager[1320]: <info> [1555343586.8279] device (enp37s0): state change: unavailable -> disconnected (reason 'carrier-changed', sys-iface-state: 'managed')
      Apr 15 17:53:06 julian-desktop NetworkManager[1320]: <info> [1555343586.8291] policy: auto-activating connection 'Kabelgebundene Verbindung 1'
      Apr 15 17:53:06 julian-desktop kernel: [ 1678.238273] igb 0000:25:00.0 enp37s0: igb: enp37s0 NIC Link is Up 100 Mbps Full Duplex, Flow Control: RX/TX
      Apr 15 17:53:06 julian-desktop NetworkManager[1320]: <info> [1555343586.8307] device (enp37s0): Activation: starting connection 'Kabelgebundene Verbindung 1' (599cf1b6-92de-3ca4-a47a-a9b8f9c1b24f)
      Apr 15 17:53:06 julian-desktop NetworkManager[1320]: <info> [1555343586.8310] device (enp37s0): state change: disconnected -> prepare (reason 'none', sys-iface-state: 'managed')
      Apr 15 17:53:06 julian-desktop NetworkManager[1320]: <info> [1555343586.8313] manager: NetworkManager state is now CONNECTING
      Apr 15 17:53:06 julian-desktop NetworkManager[1320]: <info> [1555343586.8318] device (enp37s0): state change: prepare -> config (reason 'none', sys-iface-state: 'managed')
      Apr 15 17:53:06 julian-desktop NetworkManager[1320]: <info> [1555343586.8325] device (enp37s0): state change: config -> ip-config (reason 'none', sys-iface-state: 'managed')
      Apr 15 17:53:06 julian-desktop NetworkManager[1320]: <info> [1555343586.8329] dhcp4 (enp37s0): activation: beginning transaction (timeout in 45 seconds)
      Apr 15 17:53:06 julian-desktop NetworkManager[1320]: <info> [1555343586.8347] dhcp4 (enp37s0): dhclient started with pid 4755
      Apr 15 17:53:06 julian-desktop dhclient[4755]: DHCPREQUEST of 192.168.178.42 on enp37s0 to 255.255.255.255 port 67 (xid=0x6d294be5)
      Apr 15 17:53:07 julian-desktop wpa_supplicant[1338]: wlp36s0: CTRL-EVENT-SCAN-FAILED ret=-95 retry=1
      Apr 15 17:53:08 julian-desktop wpa_supplicant[1338]: wlp36s0: CTRL-EVENT-SCAN-FAILED ret=-95 retry=1
      Apr 15 17:53:08 julian-desktop goa-daemon[2337]: goa_http_client_check() failed: 2 — Fehler beim Auflösen von »kmu.files.cnow.at«: Der Name oder der Dienst ist nicht bekannt
      Apr 15 17:53:08 julian-desktop avahi-daemon[1334]: Joining mDNS multicast group on interface enp37s0.IPv6 with address fe80::4a89:a9d2:49ca:9df4.
      Apr 15 17:53:08 julian-desktop avahi-daemon[1334]: New relevant interface enp37s0.IPv6 for mDNS.
      Apr 15 17:53:08 julian-desktop avahi-daemon[1334]: Registering new address record for fe80::4a89:a9d2:49ca:9df4 on enp37s0.*.
      Apr 15 17:53:09 julian-desktop wpa_supplicant[1338]: wlp36s0: CTRL-EVENT-SCAN-FAILED ret=-95 retry=1
      Apr 15 17:53:09 julian-desktop dhclient[4755]: DHCPREQUEST of 192.168.178.42 on enp37s0 to 255.255.255.255 port 67 (xid=0x6d294be5)
      Apr 15 17:53:09 julian-desktop dhclient[4755]: DHCPACK of 192.168.178.42 from 192.168.178.1
      Apr 15 17:53:09 julian-desktop NetworkManager[1320]: <info> [1555343589.1435] dhcp4 (enp37s0): address 192.168.178.42
      Apr 15 17:53:09 julian-desktop NetworkManager[1320]: <info> [1555343589.1435] dhcp4 (enp37s0): plen 24 (255.255.255.0)
      Apr 15 17:53:09 julian-desktop NetworkManager[1320]: <info> [1555343589.1435] dhcp4 (enp37s0): gateway 192.168.178.1
      Apr 15 17:53:09 julian-desktop NetworkManager[1320]: <info> [1555343589.1435] dhcp4 (enp37s0): lease time 864000
      Apr 15 17:53:09 julian-desktop NetworkManager[1320]: <info> [1555343589.1435] dhcp4 (enp37s0): nameserver '192.168.178.1'
      Apr 15 17:53:09 julian-desktop NetworkManager[1320]: <info> [1555343589.1435] dhcp4 (enp37s0): domain name 'fritz.box'
      Apr 15 17:53:09 julian-desktop NetworkManager[1320]: <info> [1555343589.1436] dhcp4 (enp37s0): state changed unknown -> bound
      Apr 15 17:53:09 julian-desktop avahi-daemon[1334]: Joining mDNS multicast group on interface enp37s0.IPv4 with address 192.168.178.42.
      Apr 15 17:53:09 julian-desktop avahi-daemon[1334]: New relevant interface enp37s0.IPv4 for mDNS.
      Apr 15 17:53:09 julian-desktop avahi-daemon[1334]: Registering new address record for 192.168.178.42 on enp37s0.IPv4.
      Apr 15 17:53:09 julian-desktop NetworkManager[1320]: <info> [1555343589.1456] device (enp37s0): state change: ip-config -> ip-check (reason 'none', sys-iface-state: 'managed')
      Apr 15 17:53:09 julian-desktop dhclient[4755]: bound to 192.168.178.42 -- renewal in 360679 seconds.
      Apr 15 17:53:09 julian-desktop whoopsie[2042]: [17:53:09] Cannot reach: https://daisy.ubuntu.com
      Apr 15 17:53:09 julian-desktop NetworkManager[1320]: <info> [1555343589.1466] device (enp37s0): state change: ip-check -> secondaries (reason 'none', sys-iface-state: 'managed')
      Apr 15 17:53:09 julian-desktop NetworkManager[1320]: <info> [1555343589.1469] device (enp37s0): state change: secondaries -> activated (reason 'none', sys-iface-state: 'managed')
      Apr 15 17:53:09 julian-desktop NetworkManager[1320]: <info> [1555343589.1471] manager: NetworkManager state is now CONNECTED_LOCAL
      Apr 15 17:53:09 julian-desktop NetworkManager[1320]: <info> [1555343589.1487] manager: NetworkManager state is now CONNECTED_SITE
      Apr 15 17:53:09 julian-desktop NetworkManager[1320]: <info> [1555343589.1488] policy: set 'Kabelgebundene Verbindung 1' (enp37s0) as default for IPv4 routing and DNS
      Apr 15 17:53:09 julian-desktop NetworkManager[1320]: <info> [1555343589.1492] device (enp37s0): Activation: successful, device activated.
      Apr 15 17:53:09 julian-desktop dnsmasq[1846]: lese /etc/resolv.conf
      Apr 15 17:53:09 julian-desktop dnsmasq[1846]: Benutze Namensserver 127.0.0.53#53
      Apr 15 17:53:09 julian-desktop dnsmasq[1846]: Cache geleert
      Apr 15 17:53:09 julian-desktop dnsmasq[1846]: lese /etc/resolv.conf
      Apr 15 17:53:09 julian-desktop dnsmasq[1846]: Benutze Namensserver 127.0.0.53#53
      Apr 15 17:53:09 julian-desktop dnsmasq[1846]: Cache geleert
      Apr 15 17:53:09 julian-desktop dnsmasq[1846]: lese /etc/resolv.conf
      Apr 15 17:53:09 julian-desktop dnsmasq[1846]: Benutze Namensserver 127.0.0.53#53
      Apr 15 17:53:09 julian-desktop dnsmasq[1846]: Cache geleert
      Apr 15 17:53:09 julian-desktop dbus-daemon[1302]: [system] Activating via systemd: service name='org.freedesktop.nm_dispatcher' unit='dbus-org.freedesktop.nm-dispatcher.service' requested by ':1.13' (uid=0 pid=1320 comm="/usr/sbin/NetworkManager --no-daemon " label="unconfined")
      Apr 15 17:53:09 julian-desktop dnsmasq[1846]: lese /etc/resolv.conf
      Apr 15 17:53:09 julian-desktop dnsmasq[1846]: Benutze Namensserver 127.0.0.53#53
      Apr 15 17:53:09 julian-desktop dnsmasq[1846]: Cache geleert
      Apr 15 17:53:09 julian-desktop dnsmasq[1846]: lese /etc/resolv.conf
      Apr 15 17:53:09 julian-desktop dnsmasq[1846]: Benutze Namensserver 127.0.0.53#53
      Apr 15 17:53:09 julian-desktop dnsmasq[1846]: Cache geleert


      I am fairly certain that the problem is ubuntu/pc related and that connection cable and router are fine. I tried using the same cable connection with another computer and there I don't experiance any problems. I also already updated the system but it makes no difference.



      I am not really a ubuntu superuser and kind of at a loss on how to solve/start solving this issue (with the exception of drastic measures like reinstalling the system).
      Please let me know if I can provide any additional info.






      networking 18.04 ethernet







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      Recently I have installed a new router because of a internet provider change and since then my previously faithful ethernet connection makes problems. Even though internet access and the network in general works, the ethernet connection fails every now and then for several seconds. It seems to happen preferably when starting large/fast downloads but will also happen while doing things not obviously network related.



      Here are my hardware specs:



      julian@julian-desktop:~$ lspci -nnk | grep -i net -A2
      24:00.0 Network controller [0280]: Intel Corporation Dual Band Wireless-AC 3168NGW [Stone Peak] [8086:24fb] (rev 10)
       Subsystem: Intel Corporation Device [8086:2110]
       Kernel driver in use: iwlwifi
      --
      25:00.0 Ethernet controller [0200]: Intel Corporation I211 Gigabit Network Connection [8086:1539] (rev 03)
       Subsystem: ASRock Incorporation I211 Gigabit Network Connection [1849:1539]
       Kernel driver in use: igb
       Kernel modules: igb


      And ifconfig:



      julian@julian-desktop:~$ ifconfig
      enp37s0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
       inet 192.168.178.42 netmask 255.255.255.0 broadcast 192.168.178.255
       inet6 fe80::4a89:a9d2:49ca:9df4 prefixlen 64 scopeid 0x20<link>
       ether 70:85:c2:a8:bb:7f txqueuelen 1000 (Ethernet)
       RX packets 333573 bytes 479511002 (479.5 MB)
       RX errors 2 dropped 0 overruns 0 frame 1
       TX packets 180965 bytes 14125591 (14.1 MB)
       TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
       device memory 0xf7500000-f751ffff 

      enp3s0f0u3c4i2: flags=4099<UP,BROADCAST,MULTICAST> mtu 1500
       ether 42:33:1a:65:b8:0c txqueuelen 1000 (Ethernet)
       RX packets 0 bytes 0 (0.0 B)
       RX errors 0 dropped 0 overruns 0 frame 0
       TX packets 0 bytes 0 (0.0 B)
       TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

      lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
       inet 127.0.0.1 netmask 255.0.0.0
       inet6 ::1 prefixlen 128 scopeid 0x10<host>
       loop txqueuelen 1000 (Lokale Schleife)
       RX packets 6415 bytes 586547 (586.5 KB)
       RX errors 0 dropped 0 overruns 0 frame 0
       TX packets 6415 bytes 586547 (586.5 KB)
       TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

      wlp36s0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
       inet 10.42.0.1 netmask 255.255.255.0 broadcast 10.42.0.255
       inet6 fe80::d7d4:24b5:9682:47bb prefixlen 64 scopeid 0x20<link>
       ether 3c:6a:a7:4e:40:f8 txqueuelen 1000 (Ethernet)
       RX packets 104 bytes 11975 (11.9 KB)
       RX errors 0 dropped 1 overruns 0 frame 0
       TX packets 303 bytes 47366 (47.3 KB)
       TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0


      And here is the log from /var/log/syslog one of the disconnection periods:



      Apr 15 17:52:46 julian-desktop kernel: [ 1657.601916] igb 0000:25:00.0 enp37s0: igb: enp37s0 NIC Link is Down
      Apr 15 17:52:52 julian-desktop wpa_supplicant[1338]: message repeated 21 times: [ wlp36s0: CTRL-EVENT-SCAN-FAILED ret=-95 retry=1]
      Apr 15 17:52:52 julian-desktop NetworkManager[1320]: <info> [1555343572.1914] device (enp37s0): state change: activated -> unavailable (reason 'carrier-changed', sys-iface-state: 'managed')
      Apr 15 17:52:52 julian-desktop NetworkManager[1320]: <info> [1555343572.2074] dhcp4 (enp37s0): canceled DHCP transaction, DHCP client pid 4430
      Apr 15 17:52:52 julian-desktop NetworkManager[1320]: <info> [1555343572.2074] dhcp4 (enp37s0): state changed bound -> done
      Apr 15 17:52:52 julian-desktop avahi-daemon[1334]: Withdrawing address record for 192.168.178.42 on enp37s0.
      Apr 15 17:52:52 julian-desktop avahi-daemon[1334]: Leaving mDNS multicast group on interface enp37s0.IPv4 with address 192.168.178.42.
      Apr 15 17:52:52 julian-desktop avahi-daemon[1334]: Interface enp37s0.IPv4 no longer relevant for mDNS.
      Apr 15 17:52:52 julian-desktop avahi-daemon[1334]: Withdrawing address record for fe80::4a89:a9d2:49ca:9df4 on enp37s0.
      Apr 15 17:52:52 julian-desktop avahi-daemon[1334]: Leaving mDNS multicast group on interface enp37s0.IPv6 with address fe80::4a89:a9d2:49ca:9df4.
      Apr 15 17:52:52 julian-desktop avahi-daemon[1334]: Interface enp37s0.IPv6 no longer relevant for mDNS.
      Apr 15 17:52:52 julian-desktop NetworkManager[1320]: <info> [1555343572.2104] manager: NetworkManager state is now CONNECTED_SITE
      Apr 15 17:52:52 julian-desktop NetworkManager[1320]: <info> [1555343572.2111] manager: NetworkManager state is now CONNECTED_LOCAL
      Apr 15 17:52:52 julian-desktop dbus-daemon[1302]: [system] Activating via systemd: service name='org.freedesktop.nm_dispatcher' unit='dbus-org.freedesktop.nm-dispatcher.service' requested by ':1.13' (uid=0 pid=1320 comm="/usr/sbin/NetworkManager --no-daemon " label="unconfined")
      Apr 15 17:52:52 julian-desktop whoopsie[2042]: [17:52:52] offline
      Apr 15 17:52:52 julian-desktop dnsmasq[1846]: lese /etc/resolv.conf
      Apr 15 17:52:52 julian-desktop dnsmasq[1846]: Benutze Namensserver 127.0.0.53#53
      Apr 15 17:52:52 julian-desktop dnsmasq[1846]: Cache geleert
      Apr 15 17:52:52 julian-desktop dnsmasq[1846]: lese /etc/resolv.conf
      Apr 15 17:52:52 julian-desktop dnsmasq[1846]: Benutze Namensserver 127.0.0.53#53
      Apr 15 17:52:52 julian-desktop dnsmasq[1846]: Cache geleert
      Apr 15 17:52:52 julian-desktop dnsmasq[1846]: lese /etc/resolv.conf
      Apr 15 17:52:52 julian-desktop dnsmasq[1846]: Benutze Namensserver 127.0.0.53#53
      Apr 15 17:52:52 julian-desktop dnsmasq[1846]: Cache geleert
      Apr 15 17:52:52 julian-desktop dnsmasq[1846]: lese /etc/resolv.conf
      Apr 15 17:52:52 julian-desktop dnsmasq[1846]: Benutze Namensserver 127.0.0.53#53
      Apr 15 17:52:52 julian-desktop dnsmasq[1846]: Cache geleert
      Apr 15 17:52:52 julian-desktop dnsmasq[1846]: lese /etc/resolv.conf
      Apr 15 17:52:52 julian-desktop dnsmasq[1846]: Benutze Namensserver 127.0.0.53#53
      Apr 15 17:52:52 julian-desktop dnsmasq[1846]: Cache geleert
      Apr 15 17:52:52 julian-desktop dnsmasq[1846]: lese /etc/resolv.conf
      Apr 15 17:52:52 julian-desktop dnsmasq[1846]: Benutze Namensserver 127.0.0.53#53
      Apr 15 17:52:52 julian-desktop dnsmasq[1846]: Cache geleert
      Apr 15 17:52:52 julian-desktop dnsmasq[1846]: lese /etc/resolv.conf
      Apr 15 17:52:52 julian-desktop dnsmasq[1846]: Benutze Namensserver 127.0.0.53#53
      Apr 15 17:52:52 julian-desktop dnsmasq[1846]: Cache geleert
      Apr 15 17:52:52 julian-desktop dnsmasq[1846]: lese /etc/resolv.conf
      Apr 15 17:52:52 julian-desktop dnsmasq[1846]: Benutze Namensserver 127.0.0.53#53
      Apr 15 17:52:52 julian-desktop dnsmasq[1846]: Cache geleert
      Apr 15 17:52:52 julian-desktop systemd[1]: Starting Network Manager Script Dispatcher Service...
      Apr 15 17:52:52 julian-desktop deja-dup-monito[3587]: Source ID 112 was not found when attempting to remove it
      Apr 15 17:52:52 julian-desktop gsd-sharing[2454]: Failed to StopUnit service: GDBus.Error:org.freedesktop.systemd1.NoSuchUnit: Unit gnome-user-share-webdav.service not loaded.
      Apr 15 17:52:52 julian-desktop gsd-sharing[2454]: Failed to StopUnit service: GDBus.Error:org.freedesktop.systemd1.NoSuchUnit: Unit rygel.service not loaded.
      Apr 15 17:52:52 julian-desktop dbus-daemon[1302]: [system] Successfully activated service 'org.freedesktop.nm_dispatcher'
      Apr 15 17:52:52 julian-desktop gsd-sharing[2454]: Failed to StopUnit service: GDBus.Error:org.freedesktop.systemd1.NoSuchUnit: Unit gnome-remote-desktop.service not loaded.
      Apr 15 17:52:52 julian-desktop systemd[1]: Started Network Manager Script Dispatcher Service.
      Apr 15 17:52:52 julian-desktop nm-dispatcher: req:1 'connectivity-change': new request (1 scripts)
      Apr 15 17:52:52 julian-desktop nm-dispatcher: req:1 'connectivity-change': start running ordered scripts...
      Apr 15 17:52:52 julian-desktop nm-dispatcher: req:2 'down' [enp37s0]: new request (1 scripts)
      Apr 15 17:52:52 julian-desktop nm-dispatcher: req:2 'down' [enp37s0]: start running ordered scripts...
      Apr 15 17:52:53 julian-desktop wpa_supplicant[1338]: wlp36s0: CTRL-EVENT-SCAN-FAILED ret=-95 retry=1
      Apr 15 17:52:53 julian-desktop goa-daemon[2337]: goa_http_client_check() failed: 2 — Fehler beim Auflösen von »kmu.files.cnow.at«: Der Name oder der Dienst ist nicht bekannt
      Apr 15 17:52:53 julian-desktop goa-daemon[2337]: /org/gnome/OnlineAccounts/Accounts/account_1547674158_0: Setting AttentionNeeded to TRUE because EnsureCredentials() failed with: Ungültiges Passwort für Benutzer »julian.fesel@inode.at« (goa-error-quark, 0): Rechnername konnte nicht aufgelöst werden (goa-error-quark, 4)
      Apr 15 17:52:54 julian-desktop wpa_supplicant[1338]: wlp36s0: CTRL-EVENT-SCAN-FAILED ret=-95 retry=1
      Apr 15 17:52:54 julian-desktop goa-daemon[2337]: goa_http_client_check() failed: 2 — Fehler beim Auflösen von »kmu.files.cnow.at«: Der Name oder der Dienst ist nicht bekannt
      Apr 15 17:52:55 julian-desktop wpa_supplicant[1338]: wlp36s0: CTRL-EVENT-SCAN-FAILED ret=-95 retry=1
      Apr 15 17:53:06 julian-desktop wpa_supplicant[1338]: message repeated 11 times: [ wlp36s0: CTRL-EVENT-SCAN-FAILED ret=-95 retry=1]
      Apr 15 17:53:06 julian-desktop NetworkManager[1320]: <info> [1555343586.8275] device (enp37s0): carrier: link connected
      Apr 15 17:53:06 julian-desktop NetworkManager[1320]: <info> [1555343586.8279] device (enp37s0): state change: unavailable -> disconnected (reason 'carrier-changed', sys-iface-state: 'managed')
      Apr 15 17:53:06 julian-desktop NetworkManager[1320]: <info> [1555343586.8291] policy: auto-activating connection 'Kabelgebundene Verbindung 1'
      Apr 15 17:53:06 julian-desktop kernel: [ 1678.238273] igb 0000:25:00.0 enp37s0: igb: enp37s0 NIC Link is Up 100 Mbps Full Duplex, Flow Control: RX/TX
      Apr 15 17:53:06 julian-desktop NetworkManager[1320]: <info> [1555343586.8307] device (enp37s0): Activation: starting connection 'Kabelgebundene Verbindung 1' (599cf1b6-92de-3ca4-a47a-a9b8f9c1b24f)
      Apr 15 17:53:06 julian-desktop NetworkManager[1320]: <info> [1555343586.8310] device (enp37s0): state change: disconnected -> prepare (reason 'none', sys-iface-state: 'managed')
      Apr 15 17:53:06 julian-desktop NetworkManager[1320]: <info> [1555343586.8313] manager: NetworkManager state is now CONNECTING
      Apr 15 17:53:06 julian-desktop NetworkManager[1320]: <info> [1555343586.8318] device (enp37s0): state change: prepare -> config (reason 'none', sys-iface-state: 'managed')
      Apr 15 17:53:06 julian-desktop NetworkManager[1320]: <info> [1555343586.8325] device (enp37s0): state change: config -> ip-config (reason 'none', sys-iface-state: 'managed')
      Apr 15 17:53:06 julian-desktop NetworkManager[1320]: <info> [1555343586.8329] dhcp4 (enp37s0): activation: beginning transaction (timeout in 45 seconds)
      Apr 15 17:53:06 julian-desktop NetworkManager[1320]: <info> [1555343586.8347] dhcp4 (enp37s0): dhclient started with pid 4755
      Apr 15 17:53:06 julian-desktop dhclient[4755]: DHCPREQUEST of 192.168.178.42 on enp37s0 to 255.255.255.255 port 67 (xid=0x6d294be5)
      Apr 15 17:53:07 julian-desktop wpa_supplicant[1338]: wlp36s0: CTRL-EVENT-SCAN-FAILED ret=-95 retry=1
      Apr 15 17:53:08 julian-desktop wpa_supplicant[1338]: wlp36s0: CTRL-EVENT-SCAN-FAILED ret=-95 retry=1
      Apr 15 17:53:08 julian-desktop goa-daemon[2337]: goa_http_client_check() failed: 2 — Fehler beim Auflösen von »kmu.files.cnow.at«: Der Name oder der Dienst ist nicht bekannt
      Apr 15 17:53:08 julian-desktop avahi-daemon[1334]: Joining mDNS multicast group on interface enp37s0.IPv6 with address fe80::4a89:a9d2:49ca:9df4.
      Apr 15 17:53:08 julian-desktop avahi-daemon[1334]: New relevant interface enp37s0.IPv6 for mDNS.
      Apr 15 17:53:08 julian-desktop avahi-daemon[1334]: Registering new address record for fe80::4a89:a9d2:49ca:9df4 on enp37s0.*.
      Apr 15 17:53:09 julian-desktop wpa_supplicant[1338]: wlp36s0: CTRL-EVENT-SCAN-FAILED ret=-95 retry=1
      Apr 15 17:53:09 julian-desktop dhclient[4755]: DHCPREQUEST of 192.168.178.42 on enp37s0 to 255.255.255.255 port 67 (xid=0x6d294be5)
      Apr 15 17:53:09 julian-desktop dhclient[4755]: DHCPACK of 192.168.178.42 from 192.168.178.1
      Apr 15 17:53:09 julian-desktop NetworkManager[1320]: <info> [1555343589.1435] dhcp4 (enp37s0): address 192.168.178.42
      Apr 15 17:53:09 julian-desktop NetworkManager[1320]: <info> [1555343589.1435] dhcp4 (enp37s0): plen 24 (255.255.255.0)
      Apr 15 17:53:09 julian-desktop NetworkManager[1320]: <info> [1555343589.1435] dhcp4 (enp37s0): gateway 192.168.178.1
      Apr 15 17:53:09 julian-desktop NetworkManager[1320]: <info> [1555343589.1435] dhcp4 (enp37s0): lease time 864000
      Apr 15 17:53:09 julian-desktop NetworkManager[1320]: <info> [1555343589.1435] dhcp4 (enp37s0): nameserver '192.168.178.1'
      Apr 15 17:53:09 julian-desktop NetworkManager[1320]: <info> [1555343589.1435] dhcp4 (enp37s0): domain name 'fritz.box'
      Apr 15 17:53:09 julian-desktop NetworkManager[1320]: <info> [1555343589.1436] dhcp4 (enp37s0): state changed unknown -> bound
      Apr 15 17:53:09 julian-desktop avahi-daemon[1334]: Joining mDNS multicast group on interface enp37s0.IPv4 with address 192.168.178.42.
      Apr 15 17:53:09 julian-desktop avahi-daemon[1334]: New relevant interface enp37s0.IPv4 for mDNS.
      Apr 15 17:53:09 julian-desktop avahi-daemon[1334]: Registering new address record for 192.168.178.42 on enp37s0.IPv4.
      Apr 15 17:53:09 julian-desktop NetworkManager[1320]: <info> [1555343589.1456] device (enp37s0): state change: ip-config -> ip-check (reason 'none', sys-iface-state: 'managed')
      Apr 15 17:53:09 julian-desktop dhclient[4755]: bound to 192.168.178.42 -- renewal in 360679 seconds.
      Apr 15 17:53:09 julian-desktop whoopsie[2042]: [17:53:09] Cannot reach: https://daisy.ubuntu.com
      Apr 15 17:53:09 julian-desktop NetworkManager[1320]: <info> [1555343589.1466] device (enp37s0): state change: ip-check -> secondaries (reason 'none', sys-iface-state: 'managed')
      Apr 15 17:53:09 julian-desktop NetworkManager[1320]: <info> [1555343589.1469] device (enp37s0): state change: secondaries -> activated (reason 'none', sys-iface-state: 'managed')
      Apr 15 17:53:09 julian-desktop NetworkManager[1320]: <info> [1555343589.1471] manager: NetworkManager state is now CONNECTED_LOCAL
      Apr 15 17:53:09 julian-desktop NetworkManager[1320]: <info> [1555343589.1487] manager: NetworkManager state is now CONNECTED_SITE
      Apr 15 17:53:09 julian-desktop NetworkManager[1320]: <info> [1555343589.1488] policy: set 'Kabelgebundene Verbindung 1' (enp37s0) as default for IPv4 routing and DNS
      Apr 15 17:53:09 julian-desktop NetworkManager[1320]: <info> [1555343589.1492] device (enp37s0): Activation: successful, device activated.
      Apr 15 17:53:09 julian-desktop dnsmasq[1846]: lese /etc/resolv.conf
      Apr 15 17:53:09 julian-desktop dnsmasq[1846]: Benutze Namensserver 127.0.0.53#53
      Apr 15 17:53:09 julian-desktop dnsmasq[1846]: Cache geleert
      Apr 15 17:53:09 julian-desktop dnsmasq[1846]: lese /etc/resolv.conf
      Apr 15 17:53:09 julian-desktop dnsmasq[1846]: Benutze Namensserver 127.0.0.53#53
      Apr 15 17:53:09 julian-desktop dnsmasq[1846]: Cache geleert
      Apr 15 17:53:09 julian-desktop dnsmasq[1846]: lese /etc/resolv.conf
      Apr 15 17:53:09 julian-desktop dnsmasq[1846]: Benutze Namensserver 127.0.0.53#53
      Apr 15 17:53:09 julian-desktop dnsmasq[1846]: Cache geleert
      Apr 15 17:53:09 julian-desktop dbus-daemon[1302]: [system] Activating via systemd: service name='org.freedesktop.nm_dispatcher' unit='dbus-org.freedesktop.nm-dispatcher.service' requested by ':1.13' (uid=0 pid=1320 comm="/usr/sbin/NetworkManager --no-daemon " label="unconfined")
      Apr 15 17:53:09 julian-desktop dnsmasq[1846]: lese /etc/resolv.conf
      Apr 15 17:53:09 julian-desktop dnsmasq[1846]: Benutze Namensserver 127.0.0.53#53
      Apr 15 17:53:09 julian-desktop dnsmasq[1846]: Cache geleert
      Apr 15 17:53:09 julian-desktop dnsmasq[1846]: lese /etc/resolv.conf
      Apr 15 17:53:09 julian-desktop dnsmasq[1846]: Benutze Namensserver 127.0.0.53#53
      Apr 15 17:53:09 julian-desktop dnsmasq[1846]: Cache geleert


      I am fairly certain that the problem is ubuntu/pc related and that connection cable and router are fine. I tried using the same cable connection with another computer and there I don't experiance any problems. I also already updated the system but it makes no difference.



      I am not really a ubuntu superuser and kind of at a loss on how to solve/start solving this issue (with the exception of drastic measures like reinstalling the system).
      Please let me know if I can provide any additional info.






      networking 18.04 ethernet




      networking 18.04 ethernet






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