Although, running a gdmsetup produces the following:

mark@karmic:~$ gdmsetup

** (gdmsetup:3604): WARNING **: Error calling GetValue('daemon/TimedLoginEnable'): Key not found

** (gdmsetup:3604): WARNING **: Error calling GetValue('daemon/TimedLoginDelay'): Key not found
** (gdmsetup:3604): DEBUG: init delay=30
** (gdmsetup:3604): DEBUG: GdmUserManager: Found current seat: /org/freedesktop/ConsoleKit/Seat1
** (gdmsetup:3604): DEBUG: GdmUserManager: running 'ck-history --frequent --seat='Seat1' --session-type='''
** (gdmsetup:3604): DEBUG: GdmUserManager: explicitly skipping user: nobody
** (gdmsetup:3604): DEBUG: GdmUserManager: user icon changed
** (gdmsetup:3604): DEBUG: adding monitor for '/home/mark/.face'
** (gdmsetup:3604): DEBUG: GdmUserManager: user icon changed
** (gdmsetup:3604): DEBUG: adding monitor for '/var/run/vboxadd/.face'
** (gdmsetup:3604): DEBUG: Getting list of sessions for user 999
** (gdmsetup:3604): DEBUG: Found 0 sessions for user vboxadd
** (gdmsetup:3604): DEBUG: Getting list of sessions for user 1000
** (gdmsetup:3604): DEBUG: Found 1 sessions for user mark
** (gdmsetup:3604): DEBUG: GdmUser: adding session /org/freedesktop/ConsoleKit/Session2
** (gdmsetup:3604): DEBUG: GdmUserManager: sessions changed user=mark num=1
** (gdmsetup:3604): DEBUG: GdmUserManager: added session for user: mark
** (gdmsetup:3604): DEBUG: GdmUserManager: history output: mark     11

** (gdmsetup:3604): DEBUG: GdmUserManager: history output: root     4

** (gdmsetup:3604): DEBUG: GdmUserManager: excluding user 'root'
** (gdmsetup:3604): DEBUG: Login freq 1=0 2=11

** (gdmsetup:3604): WARNING **: Error calling GetValue('daemon/AutomaticLoginEnable'): Key not found

** (gdmsetup:3604): WARNING **: Error calling GetValue('daemon/TimedLoginEnable'): Key not found

** (gdmsetup:3604): WARNING **: Error calling GetValue('daemon/TimedLogin'): Key not found
** (gdmsetup:3604): DEBUG: init user='(null)' auto=False
Segmentation fault (core dumped)
mark@karmic:~$ cls
No command 'cls' found, but there are 22 similar ones
bash: cls: command not found
mark@karmic:~$ clear

mark@karmic:~$ gdmsetup

** (gdmsetup:3611): WARNING **: Error calling GetValue('daemon/TimedLoginEnable'): Key not found

** (gdmsetup:3611): WARNING **: Error calling GetValue('daemon/TimedLoginDelay'): Key not found
** (gdmsetup:3611): DEBUG: init delay=30
** (gdmsetup:3611): DEBUG: GdmUserManager: Found current seat: /org/freedesktop/ConsoleKit/Seat1
** (gdmsetup:3611): DEBUG: GdmUserManager: running 'ck-history --frequent --seat='Seat1' --session-type='''
** (gdmsetup:3611): DEBUG: GdmUserManager: explicitly skipping user: nobody
** (gdmsetup:3611): DEBUG: GdmUserManager: user icon changed
** (gdmsetup:3611): DEBUG: adding monitor for '/home/mark/.face'
** (gdmsetup:3611): DEBUG: GdmUserManager: user icon changed
** (gdmsetup:3611): DEBUG: adding monitor for '/var/run/vboxadd/.face'
** (gdmsetup:3611): DEBUG: Getting list of sessions for user 999
** (gdmsetup:3611): DEBUG: Found 0 sessions for user vboxadd
** (gdmsetup:3611): DEBUG: Getting list of sessions for user 1000
** (gdmsetup:3611): DEBUG: Found 1 sessions for user mark
** (gdmsetup:3611): DEBUG: GdmUser: adding session /org/freedesktop/ConsoleKit/Session2
** (gdmsetup:3611): DEBUG: GdmUserManager: sessions changed user=mark num=1
** (gdmsetup:3611): DEBUG: GdmUserManager: added session for user: mark
** (gdmsetup:3611): DEBUG: GdmUserManager: history output: mark     11

** (gdmsetup:3611): DEBUG: GdmUserManager: history output: root     4

** (gdmsetup:3611): DEBUG: GdmUserManager: excluding user 'root'
** (gdmsetup:3611): DEBUG: Login freq 1=0 2=11

** (gdmsetup:3611): WARNING **: Error calling GetValue('daemon/AutomaticLoginEnable'): Key not found

** (gdmsetup:3611): WARNING **: Error calling GetValue('daemon/TimedLoginEnable'): Key not found

** (gdmsetup:3611): WARNING **: Error calling GetValue('daemon/TimedLogin'): Key not found
** (gdmsetup:3611): DEBUG: init user='(null)' auto=False
Segmentation fault (core dumped)