Ttgjyuk

Usually my Google-Fu allows me to solve most issues with Linux after enough time, but this one has me stumped.

I recently tried to install Pihole on my Plex box, which is running ubuntu 18.04.2. Everything worked fine, but pihole wasn't able to reliably block the main things I wanted blocked (mainly youtube ads over my roku), so I uninstalled it. Ever since I did that, I've been having DHCP issues with my Plex server.

I've figured out two band-aids to get things working, but I want a proper fix.

1. I can edit the resolv.conf file to add my router, or cloudflare as a DNS, which fixes all issues.


2. I can edit the netplan .yaml file to force DHCP on my ethernet device, and then apply the netplan config. This also fixes all issues.

The problem with both of these fixes is they don't persist after reboot. I think something somewhere is going wrong with Network-Manager but I'm not sure what, and I'm not sure how to fix it. I'm guessing it has something to do with PiHole not really having a true "clean" uninstall option.

I've tried the following without success:

1. Unplug and replug all networking hardware coupled with a restart of the Plex


2. sudo apt-get -d --reinstall network-manager network-manager-gnome

Upon reboot dig www.google.com is always unsuccessful, and ping -c 3 8.8.8.8 is always successful. Trying to access google via 8.8.8.8 is always unsuccessful until one of the top fixes is applied.

I'm not quite sure what will be needed to fix this but I appreciate the time of anyone who's reading this. I realize I could probably make something that runs at startup which runs the netplan apply command, but I feel like there's a better solution to this.

Thanks!

EDIT: I added this after another question similar to mine had the output requested.--------------------------
sudo lshw -C network gives:

 *-network 
 description: Ethernet interface
 product: RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller
 vendor: Realtek Semiconductor Co., Ltd.
 physical id: 0
 bus info: pci@0000:01:00.0
 logical name: enp1s0
 version: 15
 serial: 30:9c:23:d6:d4:c8
 size: 1Gbit/s
 capacity: 1Gbit/s
 width: 64 bits
 clock: 33MHz
 capabilities: pm msi pciexpress msix bus_master cap_list ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd 1000bt 1000bt-fd autonegotiation
 configuration: autonegotiation=on broadcast=yes driver=r8169 driverversion=2.3LK-NAPI duplex=full firmware=rtl8168h-2_0.0.2 02/26/15 ip=10.0.1.9 latency=0 link=yes multicast=yes port=MII speed=1Gbit/s
 resources: irq:16 ioport:3000(size=256) memory:a1104000-a1104fff memory:a1100000-a1103fff

ifconfig gives:

enp1s0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
 inet 10.0.1.9 netmask 255.255.255.0 broadcast 10.0.1.255
 inet6 fe80::329c:23ff:fed6:d4c8 prefixlen 64 scopeid 0x20<link>
 ether 30:9c:23:d6:d4:c8 txqueuelen 1000 (Ethernet)
 RX packets 29929 bytes 8095074 (8.0 MB)
 RX errors 0 dropped 0 overruns 0 frame 0
 TX packets 46972 bytes 48312760 (48.3 MB)
 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 (Local Loopback)
 RX packets 27784 bytes 41332037 (41.3 MB)
 RX errors 0 dropped 0 overruns 0 frame 0
 TX packets 27784 bytes 41332037 (41.3 MB)
 TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

cat /etc/netplan/*.yaml gives:

# Let NetworkManager manage all devices on this system
 network:
 version: 2
 renderer: NetworkManager
 ethernets:
 enp1s0:
 dhcp4: true