I have the same (or similar) problem.
To resolve the freezing of most of the gui applications, I have to repeat the
logoff-login operation, pressing the shortkey-combinations CTRL + ALT + F1, and
the problem seems to disapere.
MY PC/OS configuration
** Tags added: user-switch
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https://bugs.launchpad.net/bugs/1777405
Title:
Freezes on switching back from second login
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** Changed in: gdm3 (Ubuntu)
Status: Expired => New
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https://bugs.launchpad.net/bugs/1777405
Title:
Freezes on switching back from second login
To manage notifications about
[Expired for gdm3 (Ubuntu) because there has been no activity for 60
days.]
** Changed in: gdm3 (Ubuntu)
Status: Incomplete => Expired
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https://bugs.launchpad.net/bugs/1777405
Downgraded to those 6 .28.0-0ubuntu1 packages and rebooted: both user switching
(black screen, unresponsive computer at 1st attempt at going to user switch
screen) and hibernate resume failed.
Reverting to lightdm and all those function again
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Can you please try downloading and manually re-installing the packages
of the previous version?
https://launchpad.net/ubuntu/+source/gdm3/3.28.0-0ubuntu1/+build/14516225
** Changed in: gdm3 (Ubuntu)
Importance: Undecided => High
** Changed in: gdm3 (Ubuntu)
Status: New => Incomplete
