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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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Ubuntu's session indicator relies on dbus calls, for example the equivalent command in terminal would be this:

qdbus com.canonical.Unity /com/canonical/Unity/Session com.canonical.Unity.Session.Shutdown

As for whether or not some of the machines don't shutdown, I would assume either a bug or dbus calls are being blocked by something

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