gksu crashed with SIGSEGV in g_closure_invoke()

[Nima Saed-Samii]

Binary package hint: gksu

Description: Ubuntu intrepid (development branch)
Release: 8.10

gksu:
  Installed: 2.0.0-5ubuntu3
  Candidate: 2.0.0-5ubuntu3
  Version-Table:
 *** 2.0.0-5ubuntu3 0
        500 http://de.archive.ubuntu.com intrepid/main Packages
        100 /var/lib/dpkg/status

Tried to run gdmsetup from System->System Settings->Login Screen but gksu crashed with SIGSEGV.
Problem is not limited to gdmsetup but any attempt to run an application through gksudo or gksu ends with a SIGSEGV.
This includes, but is not limited to the Update-Manager. Running either application through sudo anything is fine.

ProblemType: Crash
Architecture: amd64
CrashCounter: 1
DistroRelease: Ubuntu 8.10
ExecutablePath: /usr/bin/gksu
NonfreeKernelModules: nvidia
Package: gksu 2.0.0-5ubuntu3
ProcCmdline: gksu /usr/sbin/gdmsetup
ProcEnviron:
 PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games
 LANG=de_DE.UTF-8
 SHELL=/bin/bash
Signal: 11
SourcePackage: gksu
StacktraceTop:
 ?? () from /usr/lib/libgksu2.so.0
 ?? () from /usr/lib/libgksu2.so.0
 g_closure_invoke ()
 ?? () from /usr/lib/libgobject-2.0.so.0
 g_signal_emit_valist ()
Title: gksu crashed with SIGSEGV in g_closure_invoke()
Uname: Linux 2.6.27-5-generic x86_64
UserGroups: adm admin audio cdrom dialout dip floppy kvm lpadmin netdev plugdev powerdev sambashare scanner video