1. Check your vga card using command
   

   sudo lspci -vnn |grep '\[030[02]\]'

   VGA has been detected in my laptop, so i get message below

   00:02.0 VGA compatible controller [0300]: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller [8086:0116] (rev 09) (prog-if 00 [VGA controller]) 
   01:00.0 VGA compatible controller [0300]: NVIDIA Corporation GF108 [GeForce GT 540M] [10de:0df4] (rev a1) (prog-if 00 [VGA controller]) 

2. Add Bumblebee Repository
   

   sudo apt-add-repository ppa:bumblebee/stable
   sudo apt-add-repository ppa:Ubuntu-x-swat/x-updates

3. Update nvidia-current package if you've install optimus card before
   

   sudo apt-get purge nvidia-current

4. Update repository list
   

   sudo apt-get update

5. Install bumblebee with the nvidia driver
   

   sudo apt-get install bumblebee bumblebee-nvidia

6. Restart your machine
   

After installing Bumblebee, by default we do not use the nvidia card when running a program. For that we need to add optirun command on the terminal to running an application using nvida card, for example

optirun blender 

We can display our nvidia card properties with this command

optirun nvidia-settings -c :8

nvidia gt540m

Might be a bit complicated to run applications with the terminal, with optirun anyway. I have two tips for running applications with bumblebee.

Using Gnome Shell
If you are using gnome shell you can using shortcut Alt + F2. You will get an box and write

optirun blender

so you can run without terminal. But i think it's same with using terminal. The differences you don't need to keep terminal open

Using Bumblebee-UI
You can using UI for running an application that must use bumblebee. There is step by step install the bumblebee ui on your machine. You must connected into internet first before follow this step.

1. Install git first

   sudo apt-get install git

2. Create a folder for git

   mkdir git

3. Go to the git folder with terminal

   cd git

4. Download bumblebee-ui from git repositroy

    git clone https://github.com/Bumblebee-Project/bumblebee-ui.git

5. Go to folder bumblebee-ui

   cd bumblebee-ui

6. Install bumblebee-ui

   sudo ./INSTALL

7. After install Bumblebee UI, open Startup Application menu and add bumblebee aplication that you can run when computer on with this command

   /usr/local/bin/bumblebee-indicator

8. Restart ccomputer and you will get an icon on top (unity) and bottom (gnome-shell) that you can use to select which program that will be run using bumblebee.