Those who are having problems with virtualbox installing due to dependency issue with new backtrack here is the solution for you :
Backtrack 5 doesnt come with the kernel headers installed.So you will need to download them and then proceed with installing virtualbox. The commands are listed below
root@bt # prepare-kernel-sources
root@bt # cd /usr/src/linux
root@bt # cp -rf include/generated/* include/linux/
After this is done, edit /etc/apt/sources.list as shown below and download virtualbox
root@bt # echo deb http://download.virtualbox.org/virtualbox/debian lucid contrib non-free >> /etc/apt/sources.list
root@bt # wget -q http://download.virtualbox.org/virtualbox/debian/oracle_vbox.asc -O- | sudo apt-key add –
root@bt # apt-get update
root@bt # apt-cache search virtualbox
root@bt # apt-get install virtualbox-4.0
Now you are ready to use virtual box 🙂 cheers have fun 😀
Dwijay's Blog 
Thanks for another informative site. Where else could I get that kind of information written in such an ideal way? I’ve a project that I’m just now working on, and I’ve been on the look out for such information.
it is not working with me
plz post an other
Can you plz give a proper description of your problem…