[Bug 35217] no indication when login fails due to lack of disk space

[Marius Gedminas]

Public bug reported:
https://launchpad.net/malone/bugs/35217

Affects: gdm (Ubuntu)
       Severity: Normal
       Priority: (none set)
         Status: Unconfirmed

Description:
I track Dapper.  I did an apt-get upgrade today, rebooted, and was
unable to log in.  After I entered my username and password, I'd briefly
see the first text console, and gdm would show me the login prompt
again.

I tried logging into /dev/tty1 and using startx, and that's where I got
an error message mentioing something about being unable to create an
authentication socket in /tmp because the disk was full.  sudo apt-get
autoclean fixed things.

It would be nice if gdm could tell the user when the session fails
because there is no free disk space in /tmp.