@forum_admin , I am sorry - I failed you earlier. I was quite tired... I did not see the important line in your post:
I feel really dumb.
The amdgpu-pro driver DKMS is not finding module support in the 5.13 kernel.
DKMS is Dynamic Kernel Module Support. THis means that if you install that driver and use DKMS, you do not need to reinstall the driver every time you upgrade the kernel. Without DKMS, you would have to reinstall it every time the kernel changed.
Can you please try:
sudo apt install linux-modules-extra-5.13.0-28-generic
If that does not work, then we need to roll you back to a kernel that is supportive of the DKMS module.
Either boot into the 5.11 kernel using your Advanced Options for Zorin
at Grub menu (Tap esc
or tab
or left shift
key at boot to pull up the menu)
Or
Install an earlier kernel.