Lubuntu 20.04. Sorry for bad English, I’m from Russia.
It is not clear for what reason, suddenly from time to time (in almost every session) such a problem appears. Photographed with a camera. Look please. I have to restart my computer to continue working.
ibb.co.com/images/PICT32167d1fb20b286e35b6.jpg
Could you just please upload the pictures here? They’re broken and don’t show otherwise.
Also we would need information on your system. Give us the results of sudo lshw -C video.
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