Enable open as administrator in nautilus!
To get started, press Ctrl – Alt – T on your keyboard to open Terminal. When it opens, run the commands below:
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sudo apt-get install nautilus-gksu
After installing that application run copy and paste the line below and press enter.
sudo cp /usr/lib/nautilus/extensions-2.0/libnautilus-gksu.so /usr/lib/nautilus/extensions-3.0/
Finally, log out and back in then go and test it, by clicking your right mouse click on the file you want to run as Admin and your see a popup menu with the words: open as administrater.
Visit: http://www.liberiangeek.net/2011/12/add-open-as-administrator-to-nautilus-context-menu-in-ubuntu-11-10-oneiric-ocelot/ for help and from here.