So I am in synaptic package manager and want to install a new Nvidia driver
which one should I pick? Which on is the non-free proprietary one?
I have a gtx580.
To know which one should you pick, use the following command in terminal:
ubuntu-drivers devices | grep recommended
It will return the recommended video driver for your machine.
ubuntu-drivers is not found, run the following command in terminal to install it:
sudo apt-get install ubuntu-drivers-common