Comment 4 for bug 1071008

packagekit updates are handled by gnome-settings-daemon. However the ubuntu build of g-s-d has packagekit disabled.

The quick fix would be to rebuild g-s-d with packagekit, but I suppose that not likely SRUable. In addition it would result in another duplicated prefs tool (software-sources and gpk-prefs update pane).

In which case for Q, I guess its better to just recommend install of update-manager.