After 2 weeks I was able to install Bumblebee on Backtrack 5.
I advice to install it on a clean installation of Backtrack.

1. Re-install & reconfigure Python
Code:
sudo apt-get install --reinstall python-software-properties && sudo dpkg-reconfigure python-software-properties
2. Update and upgrade all
Code:
sudo apt-get update
sudo apt-get upgrade
3. Install ubuntu-x-swat ppa and update again
Code:
sudo apt-add-repository ppa:ubuntu-x-swat/x-updates
sudo apt-get update
4. Install nvidia-current
Code:
sudo apt-get install nvidia-current
5. Install virtualgl
Code:
apt-get install virtualgl
6. Download latest version of Bumblebee here:
https://github.com/Bumblebee-Project...ebee/downloads

7. Install
Code:
tar -xzf bumblebee-2.4.1.tar.gz
cd bumblebee-2.4.1
sudo ./install
8. Add your username to Bumblebee
Code:
sudo usermod -a -G bumblebee YOURUSERNAME
9. Reboot

10. Fps test
Code:
root@bt:~# optirun glxgears
5170 frames in 5.0 seconds
5120 frames in 5.0 seconds
5090 frames in 5.0 seconds
5280 frames in 5.0 seconds

hf