Secure Ubuntu Desktop Using Firestarter Firewall
Firestarter is an Open Source visual firewall program. The software aims to combine ease of use with powerful features, therefore serving both Linux desktop users and system administrators.
Install Firestarter in Ubuntu
If you want to install firestarter firewall run the following command:
sudo apt-get instal firestarter
This will complete the installation
If you want to open fire starter go to System—>Administration—>Firestarter