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Just some quick installation notes for those looking wanting to install the recent Virtualbox release (3.0.4) for Backtrack 4. In case you don't know yet - BT4 is the most top rated linux live distribution focused on penetration testing. The new Debian core (Ubuntu 8.10) makes Backtrack 4 easily extendable.

I'm a huge fan of Backtrack and use it as primary Operating System (HD Installation) on one of my laptops, currently studying for the Offensive Security course "Penetration Testing with BackTrack".

If you are looking for some pointers to get BT4 persistent changes without HD installation, @kriggins "Backtrack 4 USB persistent changes Nessus HowTo" is highly recommended.

Installation

Add the following line to your /etc/apt/sources.list:

deb http://download.virtualbox.org/virtualbox/debian intrepid non-free
Add the following key to your keyring (verify!):

# wget -q http://download.virtualbox.org/virtualbox/debian/sun_vbox.asc -O- | sudo apt-key add -
Update your package cache

# apt-get update
Install Virtualbox packages

# apt-get install virtualbox-3.0
answer the prompt "Should the vboxdrv kernel module be compiled now?" with "Yes"

If it fails, have a look at /var/log/vbox-install.log and re-run /etc/init.d/vboxdrv setup after fixing the problem (usually missing header files, compiler, etc.)

start via "/usr/bin/VirtualBox" (case-sensitive!)
Virtualbox is now ready, have fun!

Note:
Thanks to dkms, the VirtualBox host kernel modules (vboxdrv,
vboxnetflt and vboxnetadp) will be updated automatically if the linux kernel
version changes during the next apt-get upgrade.

source marsmenschen.com