Ubuntu 9.04 Jaunty Jackalope doesn't show the update icon in the system tray when there are updates available. This is because the update system was changed in Ubuntu Jaunty:





Ubuntu 9.04 introduces a change to the handling of package updates, launching update-manager directly instead of displaying a notification icon in the GNOME panel. Users will still be notified of security updates on a daily basis, but for updates that are not security-related, users will only be prompted once a week.