Install VirtualBox with Gdebi in Debian:
First we update the Debian installation: apt-get update
Gdebi is a simple tool that I prefer to use in installing .deb files. With Gdebi installed, all you have to do is right-click on the deb file and install the file.
1) Install Gdebi: apt-get install gdebi
2) Download VirtualBox from Virtualbox website: https://www.virtualbox.org/wiki/Linux_Downloads
3) Install VirtualBox with GDebi: (right click on .deb file and "Open with GDebi Package Installer"....