[ubuntu] Can't get VirtualBox installed.

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http://ubuntuforums.org – I am attempting to install VirtualBox and failing miserably. I am brand new to Ubuntu (and Linux. Just started two days ago.) and want to install VirtualBox to run Windows 7; however, I don't know why it isn't working. I have tried installing it from Oracle's website. Didn't work. I tried uninstalling and re-installing. Didn't work. The main thing that is getting me is that I don't quite know how to properly install it. I have followed Oracle's instructions (I think) and when I try to install VirtualBox via the command line, I get this error: Code: Uninstalling modules from DKM (Hardware)