BackTrack is a Linux distribution that consists of several application software and an operating system. You need to update each of the components to fix the bugs contained in the previous version and also to have the latest features of the software.
We suggest you only update the software and kernel from the BackTrack software package repository, as these softwares have been tested with BackTrack.
The first thing to do after you have successfully installed and configured BackTrack is to update BackTrack itself. Since BackTrack 4 is based on Ubuntu, you can use the Ubuntu/Debian command (apt-get) to do the updating process.
apt-get will consult the
/etc/apt/sources.list file to get the update ...