How do I install Nvidia Optimus in 14.04?
I just installed nvidia-prime via terminal:
sudo apt-get install nvidia-prime
A reboot and everything worked fine. I recommend to install Prime Indicator for a fast switch:
sudo add-apt-repository ppa:nilarimogard/webupd8
sudo apt-get update
sudo apt-get install prime-indicator
Log out and log in and voila.