Now you can Shutdown, Hibernate, and restart from Unity Dash in Ubuntu 12.04 Precise Pangolin. It is really useful for those user who don't like to touch mouse or they used to use Unity Dash for everything. So here is the small solution to perform these actions easily.
Installation of Power Buttons, open Terminal and enter commands:
Via: Atareao Launchpad
sudo add-apt-repository ppa:atareao/atareao sudo apt-get update sudo apt-get install power-commands