`menu_proxy_module_load': /usr/bin/python3: undefined symbol: menu_proxy_module_load (software-properties-gtk:12762): Gtk-WARNING **: Failed to load type module: (null)

[Tobiasz Jarczyk]

This is what I get when I run software-properties-gtk:
$ software-properties-gtk
`menu_proxy_module_load': /usr/bin/python3: undefined symbol: menu_proxy_module_load

(software-properties-gtk:12762): Gtk-WARNING **: Failed to load type module: (null)

`menu_proxy_module_load': /usr/bin/python3: undefined symbol: menu_proxy_module_load

(software-properties-gtk:12762): Gtk-WARNING **: Failed to load type module: (null)

`menu_proxy_module_load': /usr/bin/python3: undefined symbol: menu_proxy_module_load

(software-properties-gtk:12762): Gtk-WARNING **: Failed to load type module: (null)

`menu_proxy_module_load': /usr/bin/python3: undefined symbol: menu_proxy_module_load

(software-properties-gtk:12762): Gtk-WARNING **: Failed to load type module: (null)

`menu_proxy_module_load': /usr/bin/python3: undefined symbol: menu_proxy_module_load

(software-properties-gtk:12762): Gtk-WARNING **: Failed to load type module: (null)

gpg: /tmp/tmpndhpza/trustdb.gpg: baza zaufania utworzona

ProblemType: Bug
DistroRelease: Ubuntu 12.10
Package: software-properties-gtk 0.92.9
ProcVersionSignature: Ubuntu 3.5.0-17.28-generic 3.5.5
Uname: Linux 3.5.0-17-generic x86_64
ApportVersion: 2.6.1-0ubuntu3
Architecture: amd64
Date: Sun Oct 21 00:02:27 2012
InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Beta amd64 (20120926)
PackageArchitecture: all
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 LANG=pl_PL.UTF-8
 SHELL=/bin/bash
SourcePackage: software-properties
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.