How to use Optimus Nvidia technology on Ubuntu 12.04 installation (for GT6xxM cards)

Ubuntu 12.04 - Bumblebee installation

# note: 4.A and 4.B are mutually exclusive 

# 1 # blumblebee repository
sudo add-apt-repository ppa:bumblebee/stable

# 2 # nvidia drivers
sudo add-apt-repository ppa:ubuntu-x-swat/x-updates

# 3 # update
sudo apt-get update

# 4.A # install bumblebee using the proprietary nvidia drivers
sudo apt-get install bumblebee bumblebee-nvidia

# 4.B # if you do not want to use the proprietary nvidia driver or 32-bit libraries (for example, if you are only interested in power savings)
sudo apt-get install --no-install-recommends bumblebee

# 5 # reboot
sudo reboot

# 6 # to run applications with nvidia card execute in the terminal: optirun [options] <application> [application-parameters], e.g.:
optirun glxspheres