How to Install Nessus on Backtrack 5

1. Open terminal and type #apt-get install Nessus

 2. Go to Bacuktrack Menu > Vulnerability Assesment > Vulnerability
     Scanner > Nessus Register.

 
3. Click Agree

4.  Type in terminal # /opt/nessus/bin/nessus-fetch --register <registration
      number> to activate nessus

5. Open browser and go to https://localhost:8834 and  installation is finish