applet.py crashed with ImportError in /usr/lib/python2.7/dist-packages/cupshelpers/cupshelpers.py: No module named packagekit.client

after boot

ProblemType: Crash
DistroRelease: Ubuntu 11.10
Package: system-config-printer-gnome 1.3.5+20110731-0ubuntu1
ProcVersionSignature: Ubuntu 3.0.0-7.9-generic 3.0.0
Uname: Linux 3.0.0-7-generic x86_64
Architecture: amd64
Date: Sun Jul 31 21:25:46 2011
ExecutablePath: /usr/share/system-config-printer/applet.py
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Alpha amd64 (20110705.1)
InterpreterPath: /usr/bin/python2.7
Lpstat: Error: command ['lpstat', '-v'] failed with exit code 1: lpstat: No destinations added.
MachineType: To Be Filled By O.E.M. To Be Filled By O.E.M.
PackageArchitecture: all
Papersize: a4
ProcCmdline: /usr/bin/python /usr/share/system-config-printer/applet.py
ProcEnviron:
 LANG=fr_FR.UTF-8
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.0.0-7-generic root=UUID=fa06b03d-1f65-49f1-99e2-df00c8c27b66 ro quiet splash vt.handoff=7
PythonArgs: ['/usr/share/system-config-printer/applet.py']
SourcePackage: system-config-printer
Title: applet.py crashed with ImportError in /usr/lib/python2.7/dist-packages/cupshelpers/cupshelpers.py: No module named packagekit.client
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare
dmi.bios.date: 01/22/2008
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: P2.20
dmi.board.name: ALiveNF7G-HD720p....
dmi.chassis.asset.tag: To Be Filled By O.E.M.
dmi.chassis.type: 3
dmi.chassis.vendor: To Be Filled By O.E.M.
dmi.chassis.version: To Be Filled By O.E.M.
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrP2.20:bd01/22/2008:svnToBeFilledByO.E.M.:pnToBeFilledByO.E.M.:pvrToBeFilledByO.E.M.:rvn:rnALiveNF7G-HD720p....:rvr:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:
dmi.product.name: To Be Filled By O.E.M.
dmi.product.version: To Be Filled By O.E.M.
dmi.sys.vendor: To Be Filled By O.E.M.