sudo apt-get install sabnzbdplus
Now we edit one of the config files:
sudo nano /etc/default/sabnzbdplus
USER=root
# The Host one can be 0.0.0.0 if you only have one IP address
HOST=0.0.0.0
# Change this to another port if 8080 is already in use.
PORT=8082
Then we make it executable:
sudo chmod +x /etc/init.d/sabnzbdplus
Then we restart the service
sudo service sabnzbdplus restart
Once this has finished point your browser to http://ipaddress:8082 and finish setting it up, you will need a usenet provider, I use newsdemon myself.