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"
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"