In VirtualBox I use the official minimal server Ubuntu distribution - JeOS. http://www.ubuntu.com/products/whatisubuntu/serveredition/jeos http://www.ubuntu.co

In VirtualBox I use the official minimal server Ubuntu distribution - JeOS. http://www.ubuntu.com/products/whatisubuntu/serveredition/jeos http://www.ubuntu.com/products/whatisubuntu/serveredition/je... If you don't need GUI it's fine. You only need to allow PAE/NX from VirtualBox settings.