Comment 6 for bug 1969275

This seems to be a nouveau/nvidia drivers topic.

I'm not a graphics expert, but if I recall correctly,
the opensource `nouveau` driver is usually disabled in
favor of the proprietary `nvidia` drivers, which seem
to work better on the Nvidia cards/gpus.

I can't provide the detailed steps right now, but just
searching for 'how to install nvidia drivers on 18.04'
gave many results which seem to be accurate about
add a PPA, apt install, nouveau check/disable, and done.

That should help you out. :)

Hope this helps!

...

P.S.:

This is not to say the nouveau driver shouldn't be fixed,
but I'd guess that due to the wider/more common usage of
the nvidia drivers, that'd be a lower relative priority.