[Debian] debian wheezy with unity-greeter

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http://ubuntuforums.org – When i asked this on debian forums, they kicked me away :) I have installed lightdm from debian repo and unity-greeter from ubuntu 12.04 package. It works fine - i can change background, choose theme and enable/disable grid. but have little problem, like this - i can't shutdown/restart from greeter. Commands from this instruction doesn't work for me. Could somebody help me with it? Sorry for my eng (Hardware)