Last Update ~ Found Solution

I tried reinstalling Ubuntu, and and gave the solutions here another try. They did not work, however I did find a solution that worked. I'll leave a link here for anyone that would have this issue, and would stumble across this post.

I did searches around for hp 17-by0021dx and RTL8723DE. I'd add the tags for both, but I can't.

https://h30434.www3.hp.com/t5/Notebook-Wireless-and-Networking/Realtek-8723DE-wifi-module-amp-Bluetooth-Linux-driver/td-p/6477307

From the link (I followed the second option):

For installing from git sources in Ubuntu:

Either download a ".zip" copy of the git sources for RTL8723DE driver
from https://github.com/lwfinger/rtlwifi_new/archive/extended.zip ,
extract it and follow step (2) below

OR

1. 
   

   Make sure you have git installed. You can install git using apt install git or through synaptic/software manager. If you want to use
   dkms to make and install the driver, make sure that dkms also is
   installed. You can download and install using below commands, in a
   terminal:

   
   
   

   :~$ sudo apt update && sudo apt install git dkms

   
   



2. The RTL8723DE driver is in the git extended branch. So,

Open a terminal:

:~$ cd Downloads

:~$ git clone -b extended --single-branch https://github.com/lwfinger/rtlwifi_new.git
unofficial
:~$ cd rtlwifi_new

Now, either you can run:
:~/Downloads/rtlwifi_new$ make 
:~/Downloads/rtlwifi_new$ sudo make install

OR use dkms to build and manage the modules:

:~/Downloads/rtlwifi_new$ sudo dkms add ../rtlwifi_new
:~/Downloads/rtlwifi_new$ sudo dkms build rtlwifi-new/0.6 
:~/Downloads/rtlwifi_new$ sudo dkms install rtlwifi-new/0.6
:~/Downloads/rtl-new/rtlwifi_new$ sudo modprobe -v rtl8723de ant_sel=2

^^ That should work. If firmware error is shown, reboot and will work.
Make sure, you have linux-headers for the respective kernel(s) and
build-essential packages installed.

For me, ant_sel=2 shows the maximum WiFi signal gain. So, I've added
below lines in a separate conf file:

:~$ sudo /bin/sh -c 'echo "options rtl8723de ant_sel=2" >> /etc/modprobe.d/rtl8723de.conf'

Hope this helps. If it does not build, use :

:~/Downloads/rtlwifi_new$ sudo dkms install rtlwifi-new/0.6 --force

_____old info below______

I just recently installed xubuntu on my laptop alongside Windows 10. I can't find a way to search for Wi-Fi connections as it doesn't give the option. I looked around online, but I didn't find anything that worked.

I had to connect to ethernet to run update and upgrade commands, but it still won't search for Wi-Fi.

rfkill

ID TYPE DEVICE SOFT HARD
 0 bluetooth hci0 unblocked unblocked

ifconfig

enp1s0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
 inet 10.0.0.168 netmask 255.255.255.0 broadcast 10.0.0.255
 inet6 fe80::7b5c:dc97:d535:2eee prefixlen 64 scopeid 0x20<link>
 ether e4:e7:49:a0:71:51 txqueuelen 1000 (Ethernet)
 RX packets 11585 bytes 8686420 (8.6 MB)
 RX errors 0 dropped 0 overruns 0 frame 0
 TX packets 7977 bytes 1095167 (1.0 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 1751 bytes 178413 (178.4 KB)
 RX errors 0 dropped 0 overruns 0 frame 0
 TX packets 1751 bytes 178413 (178.4 KB)
 TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

lspci

00:00.0 Host bridge: Intel Corporation Xeon E3-1200 v6/7th Gen Core Processor Host Bridge/DRAM Registers (rev 02)
00:02.0 VGA compatible controller: Intel Corporation HD Graphics 620 (rev 02)
00:04.0 Signal processing controller: Intel Corporation Xeon E3-1200 v5/E3-1500 v5/6th Gen Core Processor Thermal Subsystem (rev 02)
00:08.0 System peripheral: Intel Corporation Xeon E3-1200 v5/v6 / E3-1500 v5 / 6th/7th Gen Core Processor Gaussian Mixture Model
00:14.0 USB controller: Intel Corporation Sunrise Point-LP USB 3.0 xHCI Controller (rev 21)
00:14.2 Signal processing controller: Intel Corporation Sunrise Point-LP Thermal subsystem (rev 21)
00:16.0 Communication controller: Intel Corporation Sunrise Point-LP CSME HECI #1 (rev 21)
00:17.0 RAID bus controller: Intel Corporation 82801 Mobile SATA Controller [RAID mode] (rev 21)
00:1c.0 PCI bridge: Intel Corporation Sunrise Point-LP PCI Express Root Port #5 (rev f1)
00:1c.5 PCI bridge: Intel Corporation Sunrise Point-LP PCI Express Root Port #6 (rev f1)
00:1f.0 ISA bridge: Intel Corporation Intel(R) 100 Series Chipset Family LPC Controller/eSPI Controller - 9D4E (rev 21)
00:1f.2 Memory controller: Intel Corporation Sunrise Point-LP PMC (rev 21)
00:1f.3 Audio device: Intel Corporation Sunrise Point-LP HD Audio (rev 21)
00:1f.4 SMBus: Intel Corporation Sunrise Point-LP SMBus (rev 21)
01:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 15)
02:00.0 Network controller: Realtek Semiconductor Co., Ltd. Device d723

mokutil --sb-state

SecureBoot enabled

edit:

I turned off secure boot. While the advice here is certainly helping, the issue is not completely resolved. But I'm seeing the wi-fi pop in and out.

After turning off secure boot, I got the Wi-Fi option, but it's popping in and out. It's not staying on. When I do see the available wi-fi option, and I click on it, it starts to load showing a spinning circle, and then goes away and turns back into an up arrow and down arrow ↑↓

sudo lsmod

Module Size Used by
ccm 20480 0
bnep 20480 2
nls_iso8859_1 16384 1
arc4 16384 2
rtl8723de 98304 0
btcoexist 434176 1 rtl8723de
snd_hda_codec_hdmi 49152 1
phydm_mod 856064 1 rtl8723de
snd_hda_codec_realtek 106496 1
snd_hda_codec_generic 73728 1 snd_hda_codec_realtek
wmi_bmof 16384 0
hp_wmi 16384 0
sparse_keymap 16384 1 hp_wmi
intel_wmi_thunderbolt 16384 0
rtl8723_common 24576 1 rtl8723de
rtl_pci 32768 1 rtl8723de
uvcvideo 86016 0
videobuf2_vmalloc 16384 1 uvcvideo
videobuf2_memops 16384 1 videobuf2_vmalloc
videobuf2_v4l2 24576 1 uvcvideo
videobuf2_core 40960 2 videobuf2_v4l2,uvcvideo
videodev 184320 3 videobuf2_core,videobuf2_v4l2,uvcvideo
media 40960 2 videodev,uvcvideo
intel_rapl 20480 0
snd_soc_skl 90112 0
x86_pkg_temp_thermal 16384 0
snd_soc_skl_ipc 65536 1 snd_soc_skl
intel_powerclamp 16384 0
i915 1617920 4
snd_hda_ext_core 24576 1 snd_soc_skl
coretemp 16384 0
snd_soc_sst_dsp 32768 1 snd_soc_skl_ipc
kvm_intel 212992 0
kvm 598016 1 kvm_intel
snd_soc_sst_ipc 16384 1 snd_soc_skl_ipc
snd_soc_acpi 16384 1 snd_soc_skl
irqbypass 16384 1 kvm
snd_soc_core 241664 1 snd_soc_skl
crct10dif_pclmul 16384 0
snd_compress 20480 1 snd_soc_core
crc32_pclmul 16384 0
ac97_bus 16384 1 snd_soc_core
snd_pcm_dmaengine 16384 1 snd_soc_core
snd_hda_intel 40960 3
ghash_clmulni_intel 16384 0
snd_hda_codec 126976 4 snd_hda_codec_generic,snd_hda_codec_hdmi,snd_hda_intel,snd_hda_codec_realtek
pcbc 16384 0
snd_hda_core 81920 7 snd_hda_codec_generic,snd_hda_codec_hdmi,snd_hda_intel,snd_hda_ext_core,snd_hda_codec,snd_hda_codec_realtek,snd_soc_skl
snd_hwdep 20480 1 snd_hda_codec
snd_pcm 98304 8 snd_hda_codec_hdmi,snd_hda_intel,snd_hda_ext_core,snd_hda_codec,snd_soc_core,snd_soc_skl,snd_hda_core,snd_pcm_dmaengine
snd_seq_midi 16384 0
snd_seq_midi_event 16384 1 snd_seq_midi
aesni_intel 188416 0
snd_rawmidi 32768 1 snd_seq_midi
aes_x86_64 20480 1 aesni_intel
crypto_simd 16384 1 aesni_intel
glue_helper 16384 1 aesni_intel
cryptd 24576 3 crypto_simd,ghash_clmulni_intel,aesni_intel
intel_cstate 20480 0
intel_rapl_perf 16384 0
snd_seq 65536 2 snd_seq_midi,snd_seq_midi_event
rtlwifi 163840 5 rtl_pci,rtl8723de,btcoexist,phydm_mod,rtl8723_common
mac80211 778240 2 rtl_pci,rtlwifi
input_leds 16384 0
joydev 24576 0
serio_raw 16384 0
snd_seq_device 16384 3 snd_seq,snd_seq_midi,snd_rawmidi
snd_timer 32768 2 snd_seq,snd_pcm
btusb 45056 0
btrtl 16384 1 btusb
btbcm 16384 1 btusb
snd 81920 19 snd_hda_codec_generic,snd_seq,snd_seq_device,snd_hda_codec_hdmi,snd_hwdep,snd_hda_intel,snd_hda_codec,snd_hda_codec_realtek,snd_timer,snd_compress,snd_soc_core,snd_pcm,snd_rawmidi
btintel 16384 1 btusb
bluetooth 548864 12 btrtl,btintel,btbcm,bnep,btusb
soundcore 16384 1 snd
processor_thermal_device 16384 0
mei_me 40960 0
cfg80211 622592 2 rtlwifi,mac80211
drm_kms_helper 172032 1 i915
ecdh_generic 24576 1 bluetooth
mei 90112 1 mei_me
shpchp 36864 0
intel_soc_dts_iosf 16384 1 processor_thermal_device
drm 401408 5 drm_kms_helper,i915
intel_pch_thermal 16384 0
i2c_algo_bit 16384 1 i915
fb_sys_fops 16384 1 drm_kms_helper
syscopyarea 16384 1 drm_kms_helper
sysfillrect 16384 1 drm_kms_helper
sysimgblt 16384 1 drm_kms_helper
wmi 24576 3 hp_wmi,intel_wmi_thunderbolt,wmi_bmof
int3403_thermal 16384 0
int340x_thermal_zone 16384 2 int3403_thermal,processor_thermal_device
video 45056 1 i915
int3400_thermal 16384 0
acpi_thermal_rel 16384 1 int3400_thermal
mac_hid 16384 0
acpi_pad 180224 0
hp_wireless 16384 0
sch_fq_codel 20480 6
parport_pc 36864 0
ppdev 20480 0
lp 20480 0
parport 49152 3 parport_pc,lp,ppdev
ip_tables 28672 0
x_tables 40960 1 ip_tables
autofs4 40960 2
hid_generic 16384 0
usbhid 49152 0
psmouse 147456 0
r8169 86016 0
ahci 40960 4
mii 16384 1 r8169
libahci 32768 1 ahci
i2c_hid 20480 0
hid 118784 3 i2c_hid,usbhid,hid_generic

go into your bios, and disable secureboot. save and exit.

In /etc/modprobe.d/blacklist.conf I added the line: blacklist ideapad_laptop

if you just want to test this as a solution, do:sudo rmmod ideapad_laptop

I think you will find networks are available immediately. This worked on Ubuntu 18.10 why is the kernel module named ideapad_lenovo and not a more logical "realtek-something-or-other"? I have no idea, ask linus: