With Ubuntu 9.04 (codename Jaunty Jackalope) some new features have been added that you may like or dislike.
For me, one feature that I don't like is the delayed shutdown. When I'm ready to shutdown my desktop I want it to begin shutting down immediately.
Unfortunately the default setting for shutting the system down in version 9.04 is a one minute delay. You do have the option of canceling the shutdown or clicking another button to…shut it down (what is this Microsoft thinking??)
One clicks to many.
If you want change this behavior and just have the system shutdown, keep reading.
read more: Disable Delayed Shutdown Notification In Ubuntu 9.04