[ubuntu] Trying to install Prop. Nvidia drivers

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http://ubuntuforums.org – This is my first time using Ubuntu 12.04 and needless to say, I am quite lost. My laptop uses Optimus in windows, but In ubuntu I am assuming it opts for my GT 540m. My questions is how do I install proprietary drivers and is it necessary for them. Everything seems to be working, but in the system details it says "unkown" for my graphics. Should I go to the nvidia website and download the drivers from there? Thanks in advance (Hardware)