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.Users who wish to continue receiving update notifications in the previous manner can restore the earlier behavior using the following command:gconftool -s --type bool /apps/update-notifier/auto_launch false