[ubuntu] Install Virtualbox 3 on Ubuntu 12.04

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http://ubuntuforums.org – I would like to try out webOS (I have heard and seen a lot of good things about it on the web), however I'm not able to purchase a webOS smartphone. And therefore I downloaded the webOS/Palm emulator. But when I try to start the emulator it says that the emulator only works with Virtualbox 3, 3.1 or 3.2. While I had already 4.2 or 4.1 (can't remember) installed. The virtualbox linux download page says you can just use "sudo apt-get install virtualbox-3.2" to install your "favourite" version. I added the virtualbox repo's to my sources.list, added the old (virtualbox < 3. (Hardware)