Bumblebee 3.0 for Ubuntu 12.04 and 11.10

Bumblebee 3.0 for Ubuntu 12.04 and 11.10

The bumblebee project has successfully released an 'optimus replacement' for the linux platform. The latest bumblebee version was released on January 19,2012, Bumblebee 3.0 . It is very stable and enhances the performance of Ubuntu 11.10 thus allowing Unity 3d to be used.
it provides, automatic power management which also survives suspend and a greater battery time.
But as Bumblebee requires low level hardware access, you can't test this on a Virtual Machine

Installing Bumblebee

first, if you haven't already installed the restricted drivers for the Nvidia GPU, do,

sudo apt-get purge nvidia-current  // this will update the GPU drivers

Then open the terminal and add ppa Bumbleebe ”Tumbleweed”, then install

sudo add-apt-repository ppa:bumblebee/stable

sudo apt-get update 

sudo apt-get install bumblebee 

To allow you to use Bumblebee (replace $user with your username)

sudo usermod -a -G bumblebee $user

Now it's all done, restart the computer and then you can test it,
run

glxspheres

and run

optirun glxspheres

Then observe the difference. Now you can enjoy Unity 3d, in fact Ubuntu boots right into it when it was restarted.