Install VirtualBox on Ubuntu, Xubuntu or other Debian derived distributions

(Valid in 2019*) Step-by-step guide on installing Oracle VirtualBox on Xubuntu, Ubuntu or other Debian derived distributions. Install via the command line will include downloading and installing the "VirtualBox Extension Pack", so get your typing skills ready! *Note: This method has been validated in 2019 for more recent versions of Xubuntu and Virtualbox. See that video here: https://youtu.be/U89QT7rmSzM (c) 2013 & 2014 Nekita.net, excluding: otherwise copyrighted sources (as far as applicable) Products shown/demonstrated: Xubuntu 14.04 LTS, Oracle VM VirtualBox branch 4.3 version 4.3.12 & VirtualBox Extension Pack Ubuntu's website: http://www.ubuntu.com/ Xubuntu's website: http://xubuntu.org/ VirtualBox's https://www.virtualbox.org/