A firewall is a system that can be implemented in both software and hardware and intended for security. In our case we are talking about a software called Gufw and it acts as a firewall for our Linux based system. The firewall or firewall, for the least in the field, is basically like security personnel or a doorman, it lets in only the desired traffic and blocks another that is not of interest.
Thus, some unwanted traffic can be blocked, isolating our equipment from the network to make it more secure. This means that it is not exposed to so many risks, but it is not an infallible method, so do not forget common sense, use strong passwords, protect yourself from other threats and keep the software updated to avoid vulnerabilities that can be exploited by criminals who want to access your computer.
Although in Linux there are many options To keep the system protected and implement a Firewall or firewall, sometimes using certain tools can be somewhat complex for users without high knowledge. However, the tools at our disposal are very powerful and allow us to do incredible things, but for those who want something simple and fast, they can use Gufw. It is also free, free and according to its developers, it is the firewall that is implemented in the simplest way in the world ...
It has a very intuitive graphical interface, so Gufw (in fact it is a graphical interface for the ufw project) will not cause you a headache. Just install and activate it, and even if it is not the best firewall in the world, something better than nothing. However, it integrates advanced options that can be touched for further refinement of the options. But let's get into trouble to install it on Ubuntu:
sudo apt-get install gufw
You can also install it from Synaptic looking for his name if you find it easier. Then you can access the System Configuration, System, Administration and Firewall Configuration to enable it ...