gnome-sudoku crashed with RuntimeError in /usr/lib/python2.7/dist-packages/gi/overrides/Gtk.py: Gtk couldn't be initialized

I tested Weston as it was described in

https://bugs.launchpad.net/ubuntu/+source/weston/+bug/1041814

ProblemType: Crash
DistroRelease: Ubuntu 12.10
Package: gnome-sudoku 1:3.5.90-0ubuntu1
ProcVersionSignature: Ubuntu 3.5.0-12.12-generic 3.5.2
Uname: Linux 3.5.0-12-generic x86_64
ApportVersion: 2.5.1-0ubuntu2
Architecture: amd64
Date: Tue Aug 28 11:25:56 2012
ExecutablePath: /usr/games/gnome-sudoku
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
InterpreterPath: /usr/bin/python2.7
PackageArchitecture: all
ProcCmdline: python /usr/games/gnome-sudoku
PythonArgs: ['/usr/games/gnome-sudoku']
SourcePackage: gnome-games
Title: gnome-sudoku crashed with RuntimeError in /usr/lib/python2.7/dist-packages/gi/overrides/Gtk.py: Gtk couldn't be initialized
UpgradeStatus: Upgraded to quantal on 2012-06-11 (78 days ago)
UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare