Installing Virtualbox in debian etch using backports.org

Add the the following respository to /etc/apt/sources.list

deb http://www.backports.org/debian etch-backports main contrib non-free

run

apt-get update
apt-get -t etch-backports install virtualbox-ose virtualbox-ose-source

to install VirtualBox

apt-get install module-assistant
module-assistant update
module-assistant unpack virtualbox-ose
module-assistant auto-install virtualbox-ose

to compile and install the kernel module

modprobe vboxdrv

to load the kernel module

adduser yourlogin vboxusers

to add your user to the vboxusers group