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On May 8. 2018 I was prompted to upgrade from 17.10 to 18.04.
The upgrade went smooth except that the installer asked me if it could
make changes to /etc/login.defs. I thought it was supposed to not ask
questions (and stall the upgrade if I was away from the computer), but I
pressed yes and it continued. I pressed yes since I had not personally
modified this file as far as I can remember and was not particularly
attached to its contents.
After reboot gnome-initial-setup wants me to create a new user. There is
no (obvious) way to login with my old user, but Ctrl+Alt+F2 luckily
worked---I could log in and all my files where still there. I tried
changing UID_MIN in /etc/login.defs back to 500 from 1000 (I believe
this was the change I was prompted about), but I still could not login
graphically, so the /etc/login.defs change may have been unconnected to
the bug.
I was able to figure out that the offending program was called gnome-
initial-setup and an "apt purge gnome-initial-setup" later I could log
in as normal. I do not believe an average user could have figured this
out (how many even know about the virtual terminals Ctrl+Alt+FX?).
** Affects: shadow (Ubuntu)
Importance: Undecided
Status: New
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gnome-initial-setup prevents me from logging in with my existing user (UID 501)
https://bugs.launchpad.net/bugs/1770233
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