Ubuntu is a popular desktop OS, that uses the Linux kernel, but its server version is getting very popular too. The main reason is the fact that the operating system is really light and it can function on almost any kind of hardware without issues, utilizing its resources to the max. Ubuntu is also very reliable and secure and all of the Long-Term Support (LTS) versions are supported for a minimum of five years, which warrants that you should have a risk-free and stable software environment on your web hosting server at all times. Also, Ubuntu has one of the largest user communities around the world, which means that if you experience any difficulty or have any kind of question, you'll discover numerous resources on the web. One of the basic advantages of this Operating System is the fact that it contains a large number of software packages that can be freely modified according to your needs as well as the needs of the applications that you want to run, not to mention that you will not have to pay any kind of license fees at all. In comparison, other Operating Systems are paid and their code is not accessible, thus it can't be changed.