After upgrading to Ubuntu 9.04 from Ubuntu 8.10 I got the same issue.
System is up-to-date.
When I press "Shutdown" button the screen goes blank than it shows me login
screen.
Expected result - computer shutdown.
If I try "sudo halt" command - it works fine, computer shuts off.
uname -a = "Linux mot-b 2.6.28-11-generic #42-Ubuntu SMP Fri Apr 17
01:57:59 UTC 2009 i686 GNU/Linux"
** Changed in: gnome-panel (Ubuntu)
Status: Fix Released => In Progress
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Shutdown from meny does not shutdown computer, goes to GDM login screen
https://bugs.launchpad.net/bugs/8238
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