Install GUFW firewall in Ubuntu 13.04
Add the GUFW firewall to your Ubuntu 13.04 system
Here's how you can install the GUFW firewall in Ubuntu 13.04.
1. Open a terminal window.
2. Type in the following command then hit Enter.
sudo apt-get install gufw
3. Open the Dash and search for GUFW to set up your firewall.
For more, see the original article at the link below.