Could you add the journalctl log from the machine after a failing login?
** Package changed: ubuntu-release-upgrader (Ubuntu) => gdm (Ubuntu)
** Changed in: gdm (Ubuntu)
Importance: Undecided => High
** Changed in: gdm (Ubuntu)
Status: New => Incomplete
** Package changed: gdm (Ubuntu) => gdm3 (Ubuntu)
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https://bugs.launchpad.net/bugs/1793956
Title:
After upgrade from 16.04 to 18.04 : GDM login failure
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