Ubuntu 8.04 Gnome logout hangs system

After the upgrade from 7.10 to 8.04 I have hit the first small bug. I couldn’t use the “System – Quit” or the Log Out Button in Gnome to logout as they caused the session to hang. Also “gnome-session-save –kill” in a terminal caused the same fault. The only way out was a Control-Alt-Backspace. The forum is down today so I have struggled to find a solution and I have succeeded. Here it is:

Go to “System – Preferences – Sessions” and either activate or add and activate “gnome-power-manager”. and restart Gnome. That’s it, the usual logout box now appears as soon as you click the Log Out Button.