This question already has an answer here:
How am I supposed to install nvidia drivers from X-Swat? I try
sudo add-apt-repository ppa:ubuntu-x-swat/x-updates -y sudo apt-get update sudo apt-get install nvidia-graphics-drivers-304
and I get
E: Unable to locate package nvidia-graphics-drivers-304
The Launchpad page says there is
trusty, why wouldn't it install?