Cinnamon Shutdown Button Missing

First step when I install Ubuntu is to replace the Unity desktop with Cinnamon from Linux Mint. The problem is for a long time I was pressing the shutdown button and being presented with a dialog that only gave me the option to shutdown and not to cancel.

If I'm guessing what was going on correctly this is because Ubuntu uses "logind" and Cinnamon uses "consolekit", which means there are two solutions.

Nvidia Drivers on Ubuntu 16.04 LTS

So Ubuntu 16.04 LTS "Xenial Xerus" is nearly here, which will be supported until the year 2021! So nows a good time to get those Nvidia drivers working.

I wrote a post about how to do this on 15.10 and it is the exact same process. I will put a link below to it, however I'm going to post a much cleaner version right below. If you need detailed instructions; click the link. If you just need the commands; click read more.

doitonlinux.blogspot.com/2015/10/nvidia-drivers-on-ubuntu-1510.html

NVIDIA drivers: nvidia.com/Download/index.aspx
NVIDIA beta drivers: nvidia.com/Download/Find.aspx