Install gufw by entering the following commands in the terminal:
sudo apt update sudo apt install gufw
Description:
graphical user interface for ufw
gufw is an easy and intuitive way to manage your Linux firewall. It supports common tasks such as allowing or blocking pre-configured, common p2p, or individual port(s), and many others!
Homepage: http://gufw.org/
Version: 18.04.0-0ubuntu1
Section: universe/admin