update-manager crashed with RuntimeError in __main__: could not open display

[lent]

Binary package hint: update-manager

After "update-manager -d", and "apt-get purge gdm" and "apt-get install gdm gdm-guest-session", quite a few things are failing... Maybe well be configuration related.

ProblemType: Crash
DistroRelease: Ubuntu 11.04
Package: update-manager 1:0.145.13
ProcVersionSignature: Ubuntu 2.6.38-1.28-generic 2.6.38-rc2
Uname: Linux 2.6.38-1-generic i686
Architecture: i386
Date: Tue Feb 1 10:09:05 2011
ExecutablePath: /usr/bin/update-manager
InstallationMedia: Ubuntu-Netbook-Remix 9.10 "Karmic Koala" - Release i386 (20091028.4)
InterpreterPath: /usr/bin/python2.7
PackageArchitecture: all
ProcCmdline: /usr/bin/python2.7 /usr/bin/update-manager --help
ProcEnviron:
 SHELL=/bin/bash
 LANG=en_US.UTF-8
PythonArgs: ['/usr/bin/update-manager', '--help']
SourcePackage: update-manager
Title: update-manager crashed with RuntimeError in __main__: could not open display
Traceback:
 Traceback (most recent call last):
   File "/usr/bin/update-manager", line 41, in <module>
     gtk.init_check()
 RuntimeError: could not open display
UserGroups:

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Thank you for taking the time to report this crash and helping to make Ubuntu better. This particular crash has already been reported and is a duplicate of bug #350988, so is being marked as such. Please look at the other bug report to see if there is any missing information that you can provide, or to see if there is a workaround for the bug. Additionally, any further discussion regarding the bug should occur in the other report. Please continue to report any other bugs you may find.