NVidia Driver Issue MacBook Pro via Virtualbox

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http://askubuntu.com – I installed Ubuntu 12.04.1 on my macbook pro via Virtualbox and for some reason I can not get my NVidia GeForce 9400M driver to install. What are the necessary steps to install this driver? I have tried to install the Drivers via Software Center but have had no luck. I even tried a few sudo commands but after trying I realized they were for Windows host based systems. Could someone please instruct me on how to install this driver? Thank you all in advance! iz (HowTos)