How to install nvidia optimus driver on ubuntu 12.10?

view story

http://askubuntu.com – I have followed http://ubuntuportal.com/2012/01/bumblebee-3-0-tumblewed-nvidia-optimus-g... this guide to install nvidia driver on my Dell Inspiron N5110 notebook (Intel HD Graphics 3000 + NVIDIA GeForce GT525M), but i always get some error while i want to start any program with the optirun command. Terminal says: adam@Adam-LT:~$ optirun firefox [ 1482.559417] [ERROR]Cannot access secondary GPU - error: Could not load GPU driver [ 1482.559517] [ERROR]Aborting because fallback start is disabled. My laptop coole (HowTos)