I have this problem in Ubuntu Focal 20.4 installed on an iMac 21.5'
mid-2010 with a Radeon ATI card.
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Bugs, which is subscribed to plasma-workspace in Ubuntu.
https://bugs.launchpad.net/bugs/1684240
Title:
Lagging square
I have this issue when booting Ubuntu 20.4 on an iMac 21.5' mid-2010
from a Live USB pendrive.
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https://bugs.launchpad.net/bugs/1867092
Title:
Failed to set MokListRT: Invalid