I've just updated from 18.04.5 to 20.04.1 and the calendar stopped working -
none of my calendars are showing up.
This seems to be another snap-related issue, as the apt installation (version
3.36.2) works fine. I tried removing and reinstalling the snap (version 3.30.0)
but it didn't help.
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Yesterday I tried logging into Gnome just to check and it worked. I
could also log into the guest session.
Today, it seems the problem is solved. The only trick that worked for me
was installing unity-tweak and running 'unity-tweak-tool --reset unity'.
It has to be run from an X session, as from
