How to Uninstall DKMS Module on Ubuntu 20.04 LTS

Uninstalling

1. Removing DKMS Kernel Module

   Now to Remove DKMS Kernel Module
   To list the availables DKMS Modules use:

   dkms status

   In case of a Broadcom Wl Module the output is:
   bcmwl
   Possibly to find out the Module Identifier:

   ls /var/lib/dkms/bcmwl

   With a output like:
   6.30.223.271
   Then, to Remove the Module from All the Kernels use:

   sudo dkms remove bcmwl/6.30.223.271 --all

   To remove it only from the current Kernel use instead:

   sudo dkms remove bcmwl/6.30.223.271 -k `uname -r`

   Now test the new Setup rebooting:

   sudo reboot

   But in case of a Custom Kernel installation you may be forced also to Remove the Module Directory…
   Like for instance:

   sudo rm -rf /var/lib/dkms/bcmwl

   Finally, possibly you can then try to Reinstall the Module in the New Kernel.