*** This bug is a duplicate of bug 1917178 ***
    https://bugs.launchpad.net/bugs/1917178

I had a very similar problem:
whenever I clicked on a user at a login screen I had to type my password really 
quick in order for it not to be reset. Then sometimes login process stuck and I 
had to go into a text-based login prompt (ctrl+alt+f2) and then back to UI 
(ctrl+alt+f1) and this worked. Staying on the UI prompt didn't work.
After reading this thread I removed:
sudo apt purge --auto-remove fprintd libfprint-2-2

and I saw that option for fingerprint login disappeared from the user's 
settings menu.
I restarted my notebook and login screen worked without any issues.

I'm having HP EliteBook G8 and official Ubuntu notes at 
https://ubuntu.com/certified/202103-28761 
 say:
"Fingerprint reader and WWAN hardware are not supported on this device"

However, I experimented with it trying to check it after fresh
installation.

I hope these workarounds can help people struggling with the login as I did.
Also, if somebody wants any reports from me, I can try to install fprint 
libraries and reproduce it. Just let me know.

-- 
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Desktop Bugs, which is subscribed to gdm3 in Ubuntu.
https://bugs.launchpad.net/bugs/1917175

Title:
  gdm login screen says "Something went wrong please try again" three
  times and sends me back to the login screen when I'm not typing
  anything

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