I used 5.8.0-50 and had the same bug, now I upgraded to 5.8.1-050801 and
the bug disappeared
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https://bugs.launchpad.net/bugs/1924624
Title:
After upgrade to 5.8.0-49/5.8.0-50 with
Public bug reported:
After boot and login the screen flashes and when i open i.e. Firefox i
can see the desktop icons flashing
ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: xorg 1:7.7+19ubuntu14
ProcVersionSignature: Ubuntu 5.8.0-50.56~20.04.1-generic 5.8.18
Uname: Linux 5.8.0-50-generic