I have recently upgraded to Ubuntu 20.04. Lenovo ThinkPad T540 (tech spec), graphics card Intel HD Graphics 4600 in processor.
The upgrade did not go well - the display got stuck for too long (hours), so I rebooted. The upgrade was incomplete and I had to reconfigure all packages, after which it booted again.
However, there is one big annoyance: Across all desktop, I keep seeing visual artifacts, flickering 1px lines or 1px rectangles, which sometimes seem to match some panes of the windows in the background.
For instance, if I have Oracle VirtualBox manager window open in the background, and Firefox in the front, then I keep seeing the frames of VirtualBox's UI elements on Firefox'es window.
Is there something I can try to get rid of this? Assuming it may have something to do with the failed upgrade, should I re-install / re-configure something?
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