If you have installed Ubuntu 9.04 you probably noticed by now that the update-notifier icon no longer appears when there are new updates available. Instead the Update Manager window opens.
This may be a problem if you don’t notice that window and shutdown your system. After that you have to wait for new updates (and notice the Update Manager window that time) or manually look for updates.
To get the update-notifier icon just run the following:
gconftool -s --type bool /apps/update-notifier/auto_launch false
Now, restart your system or restart the update-notifier:
killall update-notifier
update-notifier &
disown
If you want to go back to the original state run the following and restart your system ou update-notifier:
gconftool -s --type bool /apps/update-notifier/auto_launch true