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I have noticed that some of my machines do not switch off (since the upgrade to Precise) when I choose "Shutdown..." from the menu in the upper right corner of Unity. If the system is powered down or not is a kind of random. However, whenever I use the Terminal to sudo shutdown -h now it will switch off the machine reliably. After having read this answer, I wonder what command Unity issues to initiate the shutdown (and power off) of the system?

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The one I use is:

sudo shutdown -P now

That will Shutdown and Power Off the PC

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Is that the one which is used by Unity to shut down the machine? – Andre Dec 3 '12 at 18:37
Not exactly but it does the same thing. – japzone Dec 3 '12 at 18:43
Doing this is indeed safe. – SiddharthaRT Dec 4 '12 at 1:03

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