When Kubuntu needs to be upgraded between versions (e.g. 9.10 to 10.04), there's a notifier icon that shows up in the system tray,
But if I click on it to start the upgrade and it fails for some reason (in my case, not enough space on the
/boot partition), the icon disappears. How can I either get it back, or run the upgrade manually, without having to log out and log back in?