Okay, I got it. My first post was basically trying to fix the problem OP had before it had happened. When I upgraded packages with aptitude it held back both libpolkit packages. Then I just installed elogind. Shut Down is in the main menu now. The whole thing just made me nervous. The fact that, using synaptic, to upgrade the libpolkit packages lvm2 needed to be removed. There was a long list of stuff it wanted to remove to install elogind.

I did not know about aptitude. It looks interesting. Thank you for your help.