There are many different ways commonly to shut down a system on Vinux or Ubuntu.
We will outline some of the more common graphical to command line.
This indicator allows you to change system settings, such as screen, power, view system details (RAM, processor, hard disk space, etc), view the programs that start up when you log in, check for and install software updates, lock your screen (useful if you are leaving your computer and do not wish for anyone else to be able to see what you have been working on), log off, suspend, or shut down your computer.
Select shutdown your computer from the bottom of the menu and you will be presented by a dialog asking if you want to shut your computer down.
To cancel this request push escape twice.