update-manager crashed with RuntimeError in <module>()

[th0r]

Binary package hint: update-manager

th0r@m0rd0r:~$ lsb_release -rd
Description: Ubuntu 8.04.1
Release: 8.04

th0r@m0rd0r:~$ apt-cache policy update-manager
update-manager:
  Installed: 1:0.87.30
  Candidate: 1:0.87.30
  Version table:
 *** 1:0.87.30 0
        500 http://archive.ubuntu.com hardy-updates/main Packages
        100 /var/lib/dpkg/status
     1:0.87.24 0
        500 http://archive.ubuntu.com hardy/main Packages

Ran update-manager -d to upgrade to ibex. Cancelled the operation as no suitable drivers were reported available for my ATI Radeon x1250 video card. Program crashed after successful rollback

ProblemType: Crash
Architecture: i386
DistroRelease: Ubuntu 8.04
ExecutablePath: /usr/bin/update-manager
InterpreterPath: /usr/bin/python2.5
NonfreeKernelModules: fglrx
Package: update-manager 1:0.87.30
PackageArchitecture: all
ProcAttrCurrent: unconfined
ProcCmdline: /usr/bin/python2.5 /usr/bin/update-manager -d
ProcEnviron:
 PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/X11R6/bin
 LANG=en_US.UTF-8
 SHELL=/bin/bash
PythonArgs: ['/usr/bin/update-manager', '-d']
SourcePackage: update-manager
Title: update-manager crashed with RuntimeError in <module>()
Traceback:
 Traceback (most recent call last):
   File "/usr/bin/update-manager", line 43, in <module>
     gtk.init_check()
 RuntimeError: could not open display
Uname: Linux 2.6.24-19-generic i686
UserGroups: