You can do it simply from your terminal window.
sudo shutdown now to shutdown your machine NOW.
sudo shutdown hh:mm where hh:mm is the time on 24hr clock to shutdown at 7:50 you need to type sudo shutdown 7:50.
sudo shutdown +m where m is the minutes. If you type sudo shutdown +120 the machine will shutdown itself in 120 minutes.
And for the non terminal guys there is an application for doing this and more its called Gshutdown.
You can install Gshutdown by simply running the sudo apt-get install gshutdown command in your terminal or through Synaptic Package Manager.
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