I'm having the exact same issue in Pop!_OS 20.04 LTS
I fixed it once by doing:
sudo dpkg --force depends -P libglib2.0-0:i386
But then the next time I did an update the issue came back again. This
definitely seems like an upstream problem as it affects multiple Ubuntu
derived distros.
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You
I have the same issue on 16.04 LTS. None of the workarounds described
here work. Once you're in full screen mode there is no way out.
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