According to the Ubuntu 9.04 release notes, there is a change in the update notification.
Change in notifications of available updates
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
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