I'm informed that this is essentially because gdm-signal is no longer in
powermanagement-interface. I'm going to copy its source into ubiquity.

There is another slight glitch here though. We need to be able to check
the DESKTOP_SESSION environment variable in ubiquity to check whether
we're running in a GNOME session or not (and, in future, we'll need
access to the environment variable that tells us how to connect to the
session bus). Since we run as root, this requires getting gksudo to
preserve those environment variables. Unfortunately, gksudo -k doesn't
seem to work properly; it needs to pass the -E option to sudo. I have a
patch to fix this but will want some extra eyeballs on it.

** Changed in: ubiquity (Ubuntu)
   Importance: Undecided => High

** Changed in: ubiquity (Ubuntu)
       Status: New => Triaged

** Changed in: ubiquity (Ubuntu)
     Assignee: (unassigned) => Colin Watson (cjwatson)

** Also affects: libgksu (Ubuntu)
   Importance: Undecided
       Status: New

-- 
GUI does not exit on reboot after install on armel
https://bugs.launchpad.net/bugs/357101
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