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

[Mhisani Fox]

Binary package hint: update-manager

Works sometimes but others just crashes with this error

ProblemType: Crash
Architecture: i386
DistroRelease: Ubuntu 9.04
ExecutablePath: /usr/bin/update-manager
InterpreterPath: /usr/bin/python2.6
Package: update-manager 1:0.111.7
PackageArchitecture: all
ProcAttrCurrent: unconfined
ProcCmdline: /usr/bin/python2.6 /usr/bin/update-manager -d
ProcEnviron:
 SHELL=/bin/bash
 PATH=(custom, no user)
 LANG=en_GB
 LANGUAGE=en_GB:en
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 44, in <module>
     gtk.init_check()
 RuntimeError: could not open display
Uname: Linux 2.6.28-6-386 i686
UserGroups:

[Mhisani Fox (mhisani)]

I dont know why it says it cannot connect to display. Other applications have no issue with this what so ever.