You can upgrade only related packages (Taken from
https://launchpad.net/ubuntu/+source/mutter/3.36.2-1ubuntu1~20.04.1):
mutter
mutter-common
libmutter-6-0
gir1.2-mutter-6
To rollback, remove proposed packages from your sources.list. Then, run
apt-update and install them.
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Regarding my previous comment, it seems I must've restarted the process
before the upgrade taking effects. After restarting Firefox, I can copy-
paste from and into it.
For me, the upgrade seems to have solved the issue!
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De
After upgrading to proposed packages, I can also confirm that unfortunately the
bug is still present. But its effects are much less than previous.
I copied an image from Telegram and I was unable to paste it in Firefox (in a
textbox where I could paste to it usually). However, I could paste it in
