I am using Lubuntu 13.04 and would like to have the power button cause the computer to shut down. Currently it only brings up the power preferences menu (logout, reboot, hibernate, etc...).

In Lubuntu, there is xfce4-power-manager v1.2 and I've tried to fix it here by setting the 
**general->when power button is pressed->shut down**
option, but this doesn't change anything.

Any help would be much appreciated.