Traceback (most recent call last):
  File "/usr/lib/packagekit/aptDBUSBackend.py", line 44, in <module>
    import dbus
  File "/var/lib/python-support/python2.6/dbus/__init__.py", line 79, in <module>
    import dbus.types as types
  File "/var/lib/python-support/python2.6/dbus/types.py", line 6, in <module>
    from _dbus_bindings import ObjectPath, ByteArray, Signature, Byte,\
ImportError: /var/lib/python-support/python2.6/_dbus_bindings.so: undefined symbol: PyUnicodeUCS4_AsEncodedString