The Ubuntu X team has a stable package PPA with the latest drivers for your card.
To install the Nvidia drivers in your system you can do so following these 3 simple steps:
Open a terminal and type
sudo add-apt-repository ppa:ubuntu-x-swat/x-updates
Update your sources and install the latest Nvidia driver (version 290.10)
sudo apt-get update && sudo apt-get install nvidia-current nvidia-settings
Reboot your system with
or by selecting
shutdown on the user menu.
This method is recommended (specially for a new user) because it makes the removal and upgrade of the graphics package easyer and transparent.
It uses the same driver as you downloaded but its already packaged for your system.