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

[Nicolas Valcarcel]

runned update-manager from terminal (byobu inside terminator) and got this message.

ProblemType: Crash
DistroRelease: Ubuntu 12.04
Package: update-manager 1:0.156.9
ProcVersionSignature: Ubuntu 3.2.0-19.31-generic 3.2.12
Uname: Linux 3.2.0-19-generic x86_64
NonfreeKernelModules: fglrx wl
ApportVersion: 1.94.1-0ubuntu2
Architecture: amd64
Date: Thu Mar 22 23:51:18 2012
ExecutablePath: /usr/bin/update-manager
GsettingsChanges: com.ubuntu.update-manager launch-time 1332478308
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Alpha amd64 (20120322)
InterpreterPath: /usr/bin/python2.7
PackageArchitecture: all
ProcCmdline: /usr/bin/python /usr/bin/update-manager
ProcEnviron:
 SHELL=/bin/bash
 TERM=xterm
 PATH=(custom, user)
 LANG=en_US.UTF-8
PythonArgs: ['/usr/bin/update-manager']
SourcePackage: update-manager
Title: update-manager crashed with RuntimeError in /usr/lib/python2.7/dist-packages/gi/overrides/Gtk.py: Gtk couldn't be initialized
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo