It suddenly appears on laptop screen and external monitor. I just installed Ubuntu 20.04.4 LTS. What can I do to remove them?
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You've provided no OS & release details; nor details as to if this is a new install, an upgrade occurred, or some change was made in the last session before this issue appeared that now needs reverting. – guiverc Aug 04 '22 at 23:41
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I added more details in question. – Mateusz Gruszka Aug 04 '22 at 23:47
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Do they appear if you boot from the Ubuntu installation USB and use the Try Ubuntu option? – user68186 Aug 05 '22 at 15:32