It looks like there are two problems here:
1. The kernel can't find the GPU at all. This is either due to a BIOS
setting or some kind of optimus / prime switch you need to flip (sorry
I'm not familiar with that).
2. You tried to manually install unsupported driver version 455.23.05
and it failed.
So first please check your BIOS and make sure the discrete GPU is
enabled. If that doesn't fix it then some quick googling suggests the
problem should be fixed by installing a working driver, so try:
sudo apt update
sudo apt install --reinstall nvidia-driver-450 nvidia-prime
** Package changed: xorg (Ubuntu) => ubuntu
** Changed in: ubuntu
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1903200
Title:
Ubuntu is unable to detect one of my GPUs
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