How to install Virtualbox in Ubuntu

With Ubuntu 8.10 you only need one command to have Virtualbox running:

sudo apt-get install virtualbox-ose

You’ll find its icon under Applications – Accessories.

In Ubuntu 8.04 and prior versions:

sudo apt-get install virtualbox-ose
sudo apt-get install virtualbox-ose-modules-`uname -r`
sudo adduser $USER vboxusers
log out and log in (hit Ctrl-Alt-Backspace)

You probably need to run second command again upon any kernel upgrade.