Tested `sudo apt install xserver-xorg-hwe-18.04` after activating proposed in the affected machine. Now working as intended. Rebooted, checked Xorg version with `sudo X -version` (X.Org X Server 1.20.1) and run `nvidia-smi` showing driver 390.77 version and installed cards without any issues.
So, this specific bug is fixed (I didn't test any further).
Tested `sudo apt install xserver- xorg-hwe- 18.04` after activating proposed in the affected machine. Now working as intended. Rebooted, checked Xorg version with `sudo X -version` (X.Org X Server 1.20.1) and run `nvidia-smi` showing driver 390.77 version and installed cards without any issues.
So, this specific bug is fixed (I didn't test any further).