kernel update to 5.3.0-46.38 broke wifi

[Michael]

my system updated to 5.3.0-46.38 and now I no longer have wifi. The driver doesn't seem to be installed since when I go to setup, wifi isn't an available option.

ProblemType: Bug
DistroRelease: Ubuntu 19.10
Package: network-manager 1.20.4-2ubuntu2.2
ProcVersionSignature: Ubuntu 5.3.0-46.38-generic 5.3.18
Uname: Linux 5.3.0-46-generic x86_64
ApportVersion: 2.20.11-0ubuntu8.8
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Tue Apr 7 11:00:53 2020
InstallationDate: Installed on 2019-10-29 (160 days ago)
InstallationMedia: Ubuntu 19.10 "Eoan Ermine" - Release amd64 (20191017)
IpRoute:

IwConfig:
 lo no wireless extensions.

 enp2s0 no wireless extensions.
ProcEnviron:
 SHELL=/bin/bash
 LANG=en_US.UTF-8
 TERM=xterm-256color
 XDG_RUNTIME_DIR=<set>
 PATH=(custom, user)
SourcePackage: network-manager
UpgradeStatus: No upgrade log present (probably fresh install)
nmcli-dev:
 DEVICE TYPE STATE IP4-CONNECTIVITY IP6-CONNECTIVITY DBUS-PATH CONNECTION CON-UUID CON-PATH
 enp2s0 ethernet unavailable none none /org/freedesktop/NetworkManager/Devices/2 -- -- --
 lo loopback unmanaged unknown unknown /org/freedesktop/NetworkManager/Devices/1 -- -- --
nmcli-nm:
 RUNNING VERSION STATE STARTUP CONNECTIVITY NETWORKING WIFI-HW WIFI WWAN-HW WWAN
 running 1.20.4 disconnected started none enabled enabled enabled enabled enabled

[Michael (mshumer0517)]

I was able to solve the problem.

1. 5.3.0-42 wifi worked
2. 5.3.0-46 wifi didn't work
3. booted into 5.3.0-42 with working wifi system
4. I used sudo lshw > lshw-42.txt to capture data
5. booted into 5.3.0-46 without working wifi
6. use sudo lshw > lshw-46.txt to capture data
7. I used diff command to compare the two .txt files
8. I determined that my hardware uses rtl8821ce driver but it wasn't working in 5.3.0-46
9. stopping and starting network-manager didn't work
10. I used cd rtl8821ce/ then sudo ./dkms-remove.sh to change directories and remove the driver
11. when I attempted to reinstall the rtl8821ce drivers in 5.3.0-46, I discovered that the kernel update hadn't installed the 5.3.0-46 headers which prevented the wifi drivers from working.
11a. I was able to connect using bluetooth and my samsung G8 phone as hotspot.
12. I have Synaptic Program Manager so I was able to see the kernel headers weren't installed with the kernel update to 5.3.0-46.
13. After installing the 5.3.0-46 headers, the "paused" rtl8821ce driver install continued and "magically" the wifi started working!
14. performed restart and cold boot to verify wifi works again!