[xubuntu] Installing nvidia proprietary drivers?

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http://ubuntuforums.org – Hi, I'm currently unsure as to how I should install nvidia's proprietary drivers on my distro. One method is through nvidia's website itself, the other is through installing certain packages or using the Additional Drivers. The problem is that I couldn't find my graphics driver under 'Additional Drivers', so I made the assumption that my graphics driver was not being used at all. How can I install nvidia proprietary drivers? Please include instructions. Thanks! (Hardware)