ubuntu-license-key-helper crashed with ImportError in /usr/share/software-center/softwarecenter/backend/__init__.py: No module named installbackend

dotnokato@none:~$ ubuntu-license-key-helper
Traceback (most recent call last):
  File "/usr/bin/ubuntu-license-key-helper", line 10, in <module>
    from softwarecenter.backend.piston.scaclient import SoftwareCenterAgentAPI
  File "/usr/share/software-center/softwarecenter/backend/__init__.py", line 19, in <module>
    from installbackend import get_install_backend
ImportError: No module named installbackend

ProblemType: Crash
DistroRelease: Ubuntu 12.10
Package: software-center-aptdaemon-plugins 0.1.3
ProcVersionSignature: Ubuntu 3.5.0-14.17-generic 3.5.3
Uname: Linux 3.5.0-14-generic x86_64
ApportVersion: 2.5.1-0ubuntu7
Architecture: amd64
CheckboxSubmission: ed6b163724c03445b4dd8678117c4efa
CheckboxSystem: b845c366ea09c60efa3a45c1b5b21525
CrashCounter: 1
Date: Fri Sep 14 21:41:40 2012
ExecutablePath: /usr/bin/ubuntu-license-key-helper
InterpreterPath: /usr/bin/python3.2mu
PackageArchitecture: all
ProcCmdline: /usr/bin/python3 /usr/bin/ubuntu-license-key-helper
PythonArgs: ['/usr/bin/ubuntu-license-key-helper']
SourcePackage: software-center-aptdaemon-plugins
Title: ubuntu-license-key-helper crashed with ImportError in /usr/share/software-center/softwarecenter/backend/__init__.py: No module named installbackend
UpgradeStatus: Upgraded to quantal on 2012-06-28 (78 days ago)
UserGroups: adm admin audio cdrom dialout fuse lpadmin netdev nopasswdlogin plugdev sambashare scanner