oneconf-query crashed with ImportError in /usr/lib/python2.7/dist-packages/oneconf/packagesethandler.py: No module named distributor

[SarahSlean]

crash , launch software firefox , thunderbird rythmbox boinc manager and synaptic

ProblemType: Crash
DistroRelease: Ubuntu 12.04
Package: oneconf 0.2.6.8ubuntu1
ProcVersionSignature: Ubuntu 3.2.0-16.25-generic-pae 3.2.6
Uname: Linux 3.2.0-16-generic-pae i686
ApportVersion: 1.91-0ubuntu1
Architecture: i386
Date: Sat Feb 18 13:28:05 2012
DuplicateOf: https://bugs.launchpad.net/bugs/934624
EcryptfsInUse: Yes
ExecutablePath: /usr/share/oneconf/oneconf-query
InterpreterPath: /usr/bin/python2.7
PackageArchitecture: all
ProcCmdline: /usr/bin/python /usr/bin/oneconf-query --async-update
ProcEnviron:
 PATH=(custom, no user)
 LANG=fr_FR.UTF-8
 SHELL=/bin/bash
PythonArgs: ['/usr/bin/oneconf-query', '--async-update']
SourcePackage: oneconf
Title: oneconf-query crashed with ImportError in /usr/lib/python2.7/dist-packages/oneconf/packagesethandler.py: No module named distributor
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo