Error con Actualización de Paquetes

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Tengo un problema con la actualizaciòn de paquetes kpackagekit. Estoy utilizando la Beta de Karmic y al querer actualizar paquetes, me sale un error. les paso el detalle del mismo:

Error Type:
Error Value: "The cache has no package named 'dpkg-exec'"
File : /usr/share/PackageKit/helpers/apt/aptBackend.py, line 1948, in
main()
File : /usr/share/PackageKit/helpers/apt/aptBackend.py, line 1945, in main
run(args, options.single)
File : /usr/share/PackageKit/helpers/apt/aptBackend.py, line 1907, in run
backend.dispatcher(args)
File : /usr/lib/python2.6/dist-packages/packagekit/backend.py, line 647, in dispatcher
self.dispatch_command(args[0], args[1:])
File : /usr/lib/python2.6/dist-packages/packagekit/backend.py, line 611, in dispatch_command
self.update_packages(package_ids)
File : /usr/share/PackageKit/helpers/apt/aptBackend.py, line 166, in _unlock_cache_afterwards
func(*args, **kwargs)
File : /usr/share/PackageKit/helpers/apt/aptBackend.py, line 1095, in update_packages
if not self._commit_changes(): return False
File : /usr/share/PackageKit/helpers/apt/aptBackend.py, line 1620, in _commit_changes
PackageKitInstallProgress(self, install_range))
File : /usr/lib/python2.6/dist-packages/apt/cache.py, line 314, in commit
res = self.installArchives(pm, installProgress)
File : /usr/lib/python2.6/dist-packages/apt/cache.py, line 289, in installArchives
res = installProgress.run(pm)
File : /usr/lib/python2.6/dist-packages/apt/progress/__init__.py, line 329, in run
res = self.waitChild()
File : /usr/lib/python2.6/dist-packages/apt/progress/__init__.py, line 298, in waitChild
self.updateInterface()
File : /usr/share/PackageKit/helpers/apt/aptBackend.py, line 398, in updateInterface
apt.progress.InstallProgress.updateInterface(self)
File : /usr/lib/python2.6/dist-packages/apt/progress/__init__.py, line 277, in updateInterface
status_str.strip())
File : /usr/share/PackageKit/helpers/apt/aptBackend.py, line 372, in statusChange
pkg = self._backend._cache[pkg_name]
File : /usr/lib/python2.6/dist-packages/apt/cache.py, line 142, in __getitem__
raise KeyError('The cache has no package named $r' $ key)

Les pedirìa si me pueden decir que problema hay a fin de solucionarlo. Gracias!