The official nvidia drivers are not working properly on my thinkpad T520 So I was going to give bumblebee a shot.

I have an ubuntu 11.04 install and am reciving a package not found error when trying to install bumblebee. I followed the instructions on the bumblebe site. It did work on my 12.10 install but not on my 11.04. the error I am receiving is

sudo apt-get install bumblebee bumblebee-nvidia

Reading package lists... Done

Building dependency tree       

Reading state information... Done

E: Unable to locate package bumblebee

E: Unable to locate package bumblebee-nvidia

Thanks