I have the same issue:
** (gdmsetup:8327): WARNING **: Error calling
GetValue('daemon/TimedLoginEnable'): Key not found
** (gdmsetup:8327): WARNING **: Error calling
GetValue('daemon/TimedLoginDelay'): Key not found
** (gdmsetup:8327): DEBUG: init delay=30
** (gdmsetup:8327): DEBUG: Failed to identify the current session: Unable to
lookup session information for process '8327'
** (gdmsetup:8327): WARNING **: Unable to find users: no seat-id found
** (gdmsetup:8327): DEBUG: GdmUserManager: explicitly skipping user: nobody
** (gdmsetup:8327): DEBUG: GdmUserManager: user icon changed
** (gdmsetup:8327): DEBUG: adding monitor for '/home/fit/.face'
** (gdmsetup:8327): DEBUG: Getting list of sessions for user 1000
** (gdmsetup:8327): DEBUG: Found 2 sessions for user fit
** (gdmsetup:8327): DEBUG: GdmUserManager: not adding session on other seat:
/org/freedesktop/ConsoleKit/Session24
** (gdmsetup:8327): DEBUG: GdmUserManager: not adding session on other seat:
/org/freedesktop/ConsoleKit/Session27
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Cannot Unlock "System > Administration > Login Screen"
https://bugs.launchpad.net/bugs/431147
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