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I am sure there must be a quicker way but when a newbie like me wants to shutdown Ubuntu 12, I do the following:
1 Move the mouse to the upper right corner and click the Settings icon
2 Click Shutdown
3 Click Shutdown in the dialog box that automatically pops up.

I know there are quicker ways but when a newbie wants to shutdown Windows 8, they do the following:
1 Move the mouse into the lower right corner to have Charms automatically pop up and click settings.
2 Click Power
3 Click Shutdown

3 newbie clicks in Ubuntu = 3 newbie clicks in Windows 8