apt-get update && apt-get upgrade, I started seeing black boxes around windows and/or instead of whole windows. Ubuntu is halfway unusable for me.
Example: this is how file browser looks like
This is how system setting looks like
And, perhaps most importantly to me, this is how both Terminal and Terminator looks like. (Yes, just a black square.) I work in Terminal and it is my basic work tool. Now, Ubuntu update (??) made my computer completely unusable for work.
All system notifications are black squares. The menus on the top bar are surrounded by black squares.
I will copy whatever information needed (even when it is hard without access to terminal, but I can use ctrl-alt-f5 & redirecting & text editor).
Booting to an older kernel does not fix the issue.