Laptops, smartphones, tablets, smart TVs, etc. … in the current era we hardly find an electronic device that isn’t connected to the Internet. It is very practical to have the full power of the Net at our fingertips, but unfortunately it is not without risks as the threat of being hacked is a real threat.
One of the best ways to mitigate this risk is to install and configure a firewall. Let see how to do it on Ubuntu.