By any chance are all of you using KDM as your login manager? I'm thinking the shutdown only works when GDM is your login manager.
Try this to set it to GDM and see if you're affected still:
sudo dpkg-reconfigure gdm
By any chance are all of you using KDM as your login manager? I'm thinking the shutdown only works when GDM is your login manager.
Try this to set it to GDM and see if you're affected still:
sudo dpkg-reconfigure gdm