HOWTO: packagekit to check update per login

PackageKit only checks once per the update interval, by default once every day.
It does not check on every desktop login.

You can change this behaviour by changing
/apps/gnome-packagekit/force_

get_updates_login to TRUE in gconf-editor. The
description of this key is: "Get the update list when the session starts, even
if not scheduled to. This ensures the user has up to date and valid data in the
tray at startup."