Comment 17 for bug 516520

Still not working right today.
I can get in through the backdoor though, so I'm poking around to see if I can find out what's going on.
Decided to try the "loging screen" in system > administration. That comes up with all options greyed out, so I clicked the 'unlock' button. Nothing happened.
Opened a terminal and gave 'sudo gdmsetup' plus my pwd. Lots of error messages and warnings, then same screen and still no way to unlock the settings. See below:

================
thomas@tom-laptop:~$ sudo gdmsetup
[sudo] password for thomas:

** (gdmsetup:3025): WARNING **: Error calling GetSoundEnabled(): The name org.gnome.DisplayManager was not provided by any .service files

** (gdmsetup:3025): WARNING **: Error calling GetFaceBrowserEnabled(): The name org.gnome.DisplayManager was not provided by any .service files

** (gdmsetup:3025): WARNING **: Error calling GetValue('daemon/TimedLoginEnable'): The name org.gnome.DisplayManager was not provided by any .service files

** (gdmsetup:3025): WARNING **: Error calling GetValue('daemon/TimedLoginDelay'): The name org.gnome.DisplayManager was not provided by any .service files
** (gdmsetup:3025): DEBUG: init delay=30
** (gdmsetup:3025): DEBUG: "/usr/share/xsessions/guest-restricted.desktop" is hidden or contains non-executable TryExec program

** (gdmsetup:3025): WARNING **: Error calling GetValue('daemon/DefaultSession'): The name org.gnome.DisplayManager was not provided by any .service files
** (gdmsetup:3025): DEBUG: Init default session found:'(null)'
** (gdmsetup:3025): DEBUG: Failed to identify the current session: Unable to lookup session information for process '3025'

** (gdmsetup:3025): WARNING **: Unable to find users: no seat-id found
** (gdmsetup:3025): DEBUG: GdmUserManager: explicitly skipping user: nobody
** (gdmsetup:3025): DEBUG: GdmUserManager: user icon changed
** (gdmsetup:3025): DEBUG: adding monitor for '/home/thomas/.face'
** (gdmsetup:3025): DEBUG: Getting list of sessions for user 1000
** (gdmsetup:3025): DEBUG: Found 2 sessions for user thomas
** (gdmsetup:3025): DEBUG: GdmUserManager: not adding session on other seat: /org/freedesktop/ConsoleKit/Session1
** (gdmsetup:3025): DEBUG: GdmUserManager: not adding session on other seat: /org/freedesktop/ConsoleKit/Session2

** (gdmsetup:3025): WARNING **: Failed to unlock: The name org.gnome.DisplayManager was not provided by any .service files

** (gdmsetup:3025): WARNING **: Failed to unlock: The name org.gnome.DisplayManager was not provided by any .service files
thomas@tom-laptop:~$
===========

Have reinstalled gdm, gdm-guest-session, gnome-session-bin and libpam-gnome-keyring (basically anything I see when I search for gdm in synaptic), but no joy.

If there are any logfiles I can check out and post, plz let me know.

cheers
Tom