[Bug 1412791] [NEW] automatic login configured in ubiquity cannot be disabled by gnome-control-center

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Release: vivid (fresh install with ubuntu-gnome-desktop)
Version: 
    ubiquity 2.21.4
    gnome-control-center 1:3.14.2-2ubuntu1
    gdm 3.14.1-0ubuntu1


What I expected:

+ Fresh install with ubiquity, create a user with auto-login enabled
+ User logs in automatically on subsequent boots
+ Disable auto-login via System -> Users -> Unlock -> Automatic login (OFF)
+ Restart and see gdm login dialog

What happened:

+ After disabling auto-login, the user is nonetheless automatically
logged if gdm is left alone for 10 seconds

If auto-login is selected in ubiquity, it appears to write the following
into /etc/gdm/custom.conf (relevant code at d-i/source/user-setup/user-
setup-apply:268)

    AutomaticLoginEnable=true
    AutomaticLogin=$USER
    TimedLoginEnable=true
    TimedLogin=$USER
    TimedLoginDelay=10

While toggling auto-login in gnome-control-center only appears to toggle
the value after AutomaticLoginEnable (and hence, timed login remains
true, and the assumption that a password should now be required is
violated).

** Affects: ubuntu-gnome
     Importance: Undecided
         Status: New

** Affects: user-setup (Ubuntu)
     Importance: Undecided
         Status: New

-- 
automatic login configured in ubiquity cannot be disabled by gnome-control-center
https://bugs.launchpad.net/bugs/1412791
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