Today I attempted to log in to my work laptop and got an invalid credentials message. I was still able to log into the local admin and change the password. However, after rebooting, I get the same message and have to change the password again.
To me this is just bizarre, so I'm not really sure where to start diagnosing the problem.
- My own account was removed only from the sudo group (other groups were still present).
- The account in question is not visible from the GDM login GUI. I added a test account and it is visible and can be logged into without the password reset dance.
Version is 18.04
Output of /etc/passwd and /etc/group. Account in question is my.name
UPDATE: I re-added the account to the sudo group and that change seems to be persisting through reboot.