Public bug reported:

Binary package hint: gdm

Installed i386 Karmic from installer cd, enabled 'log in automatically'
during the install process. Did "aptitude full-upgrade", and now gdm
freezes during boot: monitor is black, num-lock led doesn't react to
toggling num lock key, no disk activity i.e. whole computer appears
crashed.

Can boot by selecting 'recovery' option in grub menu, which gives a
command-line login, after logging in there, can start GUI with 'startx'
(which launches desktop, i.e. not gdm login screen).

My symptoms are basically the same as described in 
http://ubuntuforums.org/showpost.php?p=8211116&postcount=5
(except that in my case the freeze is with a completely blank screen). 

Also (which might be related), I can't seem to unlock the gdm settings dialog 
(the one started with 'System->Administration->Login screen'): clicking on the 
unlock button has no effect, the widgets stay greyed-out. Starting gdmsetup 
from a root terminal, I get:
r...@desktop:/etc/gdm# gdmsetup

** (gdmsetup:2319): WARNING **: Error calling
GetValue('daemon/TimedLoginEnable'): The name org.gnome.DisplayManager
was not provided by any .service files

** (gdmsetup:2319): WARNING **: Error calling 
GetValue('daemon/TimedLoginDelay'): The name org.gnome.DisplayManager was not 
provided by any .service files
** (gdmsetup:2319): DEBUG: init delay=30
** (gdmsetup:2319): DEBUG: GdmUserManager: Found current seat: 
/org/freedesktop/ConsoleKit/Seat1
** (gdmsetup:2319): DEBUG: GdmUserManager: running 'ck-history --frequent 
--seat='Seat1' --session-type='''
** (gdmsetup:2319): DEBUG: GdmUserManager: explicitly skipping user: nobody
** (gdmsetup:2319): DEBUG: GdmUserManager: user icon changed
** (gdmsetup:2319): DEBUG: adding monitor for '/home/istvan/.face'
** (gdmsetup:2319): DEBUG: Getting list of sessions for user 1000
** (gdmsetup:2319): DEBUG: Found 1 sessions for user istvan
** (gdmsetup:2319): DEBUG: GdmUserManager: not adding session without a x11 
display: /org/freedesktop/ConsoleKit/Session1
** (gdmsetup:2319): DEBUG: GdmUserManager: history output: istvan   4

** (gdmsetup:2319): DEBUG: GdmUserManager: history output: root     4

** (gdmsetup:2319): DEBUG: GdmUserManager: excluding user 'root'

** (gdmsetup:2319): WARNING **: Error calling
GetValue('daemon/AutomaticLoginEnable'): The name
org.gnome.DisplayManager was not provided by any .service files

** (gdmsetup:2319): WARNING **: Error calling
GetValue('daemon/TimedLoginEnable'): The name org.gnome.DisplayManager
was not provided by any .service files

** (gdmsetup:2319): WARNING **: Error calling GetValue('daemon/TimedLogin'): 
The name org.gnome.DisplayManager was not provided by any .service files
** (gdmsetup:2319): DEBUG: init user='(null)' auto=False

with 
** (gdmsetup:2319): WARNING **: Failed to unlock: The name 
org.gnome.DisplayManager was not provided by any .service files
repeated every time I press the 'unlock' button.


I'll try disabling auto-login as described in that forum post, but even if that 
works, the bug is pretty serious: simply installing karmic and all updates 
makes the computer completely unusable for a non-pro user

** Affects: gdm (Ubuntu)
     Importance: Undecided
         Status: New

-- 
complete freeze on boot with autologin enabled
https://bugs.launchpad.net/bugs/493272
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