aptDBUSBackend.py crashed with ImportError in <module>()

[ramadasan7]

Binary package hint: packagekit

The msg appeared while updating.

ProblemType: Crash
Architecture: amd64
DistroRelease: Ubuntu 9.04
ExecutablePath: /usr/lib/packagekit/aptDBUSBackend.py
InterpreterPath: /usr/bin/python2.6
Package: packagekit-backend-apt 0.3.14-0ubuntu4
ProcAttrCurrent: unconfined
ProcCmdline: python /usr/lib/packagekit/aptDBUSBackend.py
ProcEnviron:

PythonArgs: ['/usr/lib/packagekit/aptDBUSBackend.py']
SourcePackage: packagekit
Title: aptDBUSBackend.py crashed with ImportError in <module>()
Traceback:
 Traceback (most recent call last):
   File "/usr/lib/packagekit/aptDBUSBackend.py", line 50, in <module>
     from packagekit.daemonBackend import PACKAGEKIT_DBUS_INTERFACE, PACKAGEKIT_DBUS_PATH, PackageKitBaseBackend, PackagekitProgress, pklog, threaded, serialize
 ImportError: No module named packagekit.daemonBackend
Uname: Linux 2.6.28-8-generic x86_64
UserGroups: