Most computers come pre-installed with an operating system like Ubuntu, which is commonly used to run programs. The operating system serves as a link between the computer’s hardware and software, ensuring the best possible performance. Ubuntu, in particular, is a commercial operating system with limited access to its source code. Linux, on the other hand, is completely open-source. Continue reading if you are interested in gaining knowledge without spending any money. I will discuss the top five free programs for learning Linux and Ubuntu. Let’s start with an overview of Linux and Ubuntu.