I had the problem after the upgrade from Percise to Quantal Beta1. It
did not happen during the upgrade from Percise to any of the Quantal
Alpha versions.
For me the GUEST account login was successful, but useless because I was
unable to elevate privileges using sudo ("unable to change to sudoers
gid: Operation not permitted") - so I could not troubleshoot the
problem.
My work around was to create a second administrator account called
'toad2' right after the upgrade but before the required reboot. I was
then able to log in using the new toad2 user account but not the
original toad account created using Precise.
Oddly - when I am attempting to login - I can click on the various user
accounts displayed in the Unity Greeter (lightdm) and I see the
appropriate wallpapers displayed as I switch back and forth between
users.
That seems like a good sign, but I still get bounced back to the Unity
Greater after using the original Precise created user account.
I did notice a warning about something related to /TMP being 'missing' or 'not
found' or something during the initial UBUNTU boot-up. I thought it was part
of that typical 'checking disk status' routing we see from time to time. It
just went away by itself.
Its strange that it would affect one user account and not the others.
This issue is discussed in the ubuntuforums
(http://ubuntuforums.org/showthread.php?p=12254228#post12254228).
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https://bugs.launchpad.net/bugs/999526
Title:
Cannot login from lightdm, /tmp is not writable
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