Can't access Shutdown button in Ubuntu 10.4

The Shutdown button bug like this often happens in ubuntu Lucid Lynx.

Power button disappeared in ubuntu 10.04?
then how do we fix this bug?
don't worry, we can fix this with a very easy way.
Just Press ALT+F2 and then the Run Application windows will show up. After that what we need to do is just type:

   killall gnome-panel

Press Enter..! then the gnome-panel will restart it's service and your power button will be normal again.. :D


Reference : http://ubuntuforums.org/showthread.php?t=1545152