I am experiencing this bug as well in both gdmsetup, and users-admin
after upgrading from 9.04 to 9.10.  The users-admin unlock button is
greyed and says:

Not authorized to make changes

If I run gksu users-admin it works fine...

I think it also might be related to why the Shutdown/Restart is greyed
from the System > Shutdown menu

My system is up to date:

m...@md:~$ uname -r
2.6.31-17-generic

m...@md:~$ ck-list-sessions 
Session3:
        unix-user = '1000'
        realname = 'Michael Dance'
        seat = 'Seat5'
        session-type = ''
        active = FALSE
        x11-display = ':0'
        x11-display-device = '/dev/tty7'
        display-device = ''
        remote-host-name = ''
        is-local = TRUE
        on-since = '2009-12-27T00:55:16.343876Z'
        login-session-id = '4294967295'
Session6:
        unix-user = '1000'
        realname = 'Michael Dance'
        seat = 'Seat8'
        session-type = ''
        active = FALSE
        x11-display = ''
        x11-display-device = ''
        display-device = '/dev/smb/7139/100'
        remote-host-name = '::ffff:127.0.0.1'
        is-local = FALSE
        on-since = '2009-12-27T20:13:22.764843Z'
        login-session-id = '4294967295'

m...@md:~$ ps aux | grep polkit-gnome-authentication-agent-1
md        7643  0.0  0.1 147336  6268 ?        S    Dec27   0:00 
/usr/lib/policykit-1-gnome/polkit-gnome-authentication-agent-1
md        8826  0.0  0.0   7336   896 pts/0    R+   09:34   0:00 grep 
--color=auto polkit-gnome-authentication-agent-1

m...@md:~$ gdmsetup

** (gdmsetup:8951): WARNING **: Error calling
GetValue('daemon/TimedLoginEnable'): Key not found

** (gdmsetup:8951): WARNING **: Error calling 
GetValue('daemon/TimedLoginDelay'): Key not found
** (gdmsetup:8951): DEBUG: init delay=30
** (gdmsetup:8951): DEBUG: GdmUserManager: skipping shell /bin/false
** (gdmsetup:8951): DEBUG: GdmUserManager: Found current seat: 
/org/freedesktop/ConsoleKit/Seat5
** (gdmsetup:8951): DEBUG: GdmUserManager: running 'ck-history --frequent 
--seat='Seat5' --session-type='''
** (gdmsetup:8951): DEBUG: GdmUserManager: explicitly skipping user: nobody
** (gdmsetup:8951): DEBUG: GdmUserManager: user icon changed
** (gdmsetup:8951): DEBUG: adding monitor for '/home/md/.face'
** (gdmsetup:8951): DEBUG: GdmUserManager: user icon changed
** (gdmsetup:8951): DEBUG: adding monitor for '/home/svn/.face'
** (gdmsetup:8951): DEBUG: GdmUserManager: user icon changed
** (gdmsetup:8951): DEBUG: adding monitor for '/home/garydance/.face'
** (gdmsetup:8951): DEBUG: GdmUserManager: user icon changed
** (gdmsetup:8951): DEBUG: adding monitor for '/var/aegir/.face'
** (gdmsetup:8951): DEBUG: Getting list of sessions for user 1003
** (gdmsetup:8951): DEBUG: Found 0 sessions for user aegir
** (gdmsetup:8951): DEBUG: Getting list of sessions for user 1002
** (gdmsetup:8951): DEBUG: Found 0 sessions for user garydance
** (gdmsetup:8951): DEBUG: Getting list of sessions for user 1001
** (gdmsetup:8951): DEBUG: Found 0 sessions for user svn
** (gdmsetup:8951): DEBUG: Getting list of sessions for user 1000
** (gdmsetup:8951): DEBUG: Found 2 sessions for user md
** (gdmsetup:8951): DEBUG: GdmUser: adding session 
/org/freedesktop/ConsoleKit/Session3
** (gdmsetup:8951): DEBUG: GdmUserManager: sessions changed user=md num=1
** (gdmsetup:8951): DEBUG: GdmUserManager: added session for user: md
** (gdmsetup:8951): DEBUG: GdmUserManager: not adding session on other seat: 
/org/freedesktop/ConsoleKit/Session6

-- 
Cannot Unlock "System > Administration > Login Screen"
https://bugs.launchpad.net/bugs/431147
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