How to properly remove kernel modules for RTL88x2BU in Ubuntu MATE 19.04

I have installed Realtek RTL88x2BU drivers from Cilynx's GitHub repo using DKMS installation in Ubuntu MATE 19.04 with kernel 5.3.4 (and later 5.3.7)

Drivers worked fine for a week, then suddenly stopped detecting TP-Link Archer T3U AC1300 Wireless USB Adapter altogether. The same adapter works fine with other PC.

This is how drivers were installed:

cd rtl88x2bu
VER=$(sed -n 's/\PACKAGE_VERSION="\(.*\)"/\1/p' dkms.conf)
sudo rsync -rvhP ./ /usr/src/rtl88x2bu-${VER}
sudo dkms add -m rtl88x2bu -v ${VER}
sudo dkms build -m rtl88x2bu -v ${VER}
sudo dkms install -m rtl88x2bu -v ${VER}
sudo modprobe 88x2bu

So how could I completely remove kernel modules of all the previous versions (1.1, 5.6.1, etc) for RTL88x2BU? Many thanks.

You can do the reverse steps:

1. Unload module

   sudo modprobe -r 8822bu
   sudo modprobe -r rtl88x2bu
   

2. Check for all module builds status

   sudo dkms status
   

   output

   8822bu, 1.1: added
   rtl88x2bu, 5.6.1, 5.2.21-050221-generic, x86_64: installed
   rtl88x2bu, 5.6.1, 5.3.7-050307-generic, x86_64: installed
   

3. Unregister it from DKMS, sudo dkms uninstall .. is optional as we are looking for complete purge.

   sudo dkms remove -m 8822bu/1.1
   sudo dkms remove -m rtl88x2bu/5.6.1 -k 5.2.21-050221-generic
   sudo dkms remove -m rtl88x2bu/5.6.1 -k 5.3.7-050307-generic
   

4. Remove source from DKMS

   cd /usr/src/
   

   WARNING: Be careful rm -r is a dangerous command!

   sudo rm -r rtl88x2bu-*