An internal system error has occurred

[nadazero]

I'm in VirtualBox OSE

1)
 lsb_release -rd ->
Ubuntu karmic (development branch)
Release 9.10
2)
apt-cache policy packagekit ->
packagekit:
  Installed: 0.4.8-0ubuntu5
  Candidate: 0.4.8-0ubuntu5
  Version table:
 *** 0.4.8-0ubuntu5 0
        500 http://dk.archive.ubuntu.com karmic/main Packages
        100 /var/lib/dpkg/status
3) I'm in Kubuntu+1, Kubuntu 9.10 (Karmic Koala) Daily Build 20090821. I select "System Settings/Add and Remove Software/Software Updates
4) A messagebox is shown:
"A problem we were not expecting has occurred. Please report this bug with the error description"
Details >>>
Error Type: Error Value: 'PackageKitCache' object has no attribute '_dict' File : /usr/share/PackageKit/helpers/apt/aptBackend.py, line 1966, in main() File : /usr/share/PackageKit/helpers/apt/aptBackend.py, line 1963, in main run(args, options.single) File : /usr/share/PackageKit/helpers/apt/aptBackend.py, line 1925, in run backend.dispatcher(args) File : /usr/lib/python2.6/dist-packages/packagekit/backend.py, line 643, in dispatcher self.dispatch_command(args[0], args[1:]) File : /usr/lib/python2.6/dist-packages/packagekit/backend.py, line 540, in dispatch_command self.get_updates(filters) File : /usr/share/PackageKit/helpers/apt/aptBackend.py, line 653, in get_updates for pkg in self._cache.getChanges(): File : /usr/lib/python2.6/dist-packages/apt/cache.py, line 164, in getChanges for p in self: File : /usr/share/PackageKit/helpers/apt/aptBackend.py, line 196, in __iter__ for pkgname in sorted(self._dict.keys()):

"Help/Report a bug" gives an error "Invalid proble/ No such file or directory"