Ubuntu is a well known desktop OS, which uses the Linux kernel, and its server version is getting really popular as well. The main reason is the fact that the operating system is extremely light and it will function on almost any kind of hardware without any issues, utilizing its resources to the maximum. Ubuntu is also extremely reliable and secure and all Long-Term Support (LTS) versions are supported for a minimum of 5 years, which guarantees that you will have a safe and dependable software environment on your server at all times. Furthermore, Ubuntu has one of the biggest user communities in the world, so if you experience any problem or have any question, you will discover plenty of resources on the web. One of the main advantages of this OS is the fact that it contains a large number of software packages which can be easily adjusted according to your needs as well as the requirements of the applications which you intend to run, not to mention that you will not have to pay any kind of license fees at all. In contrast, other Operating Systems are paid and their program code is not accessible, therefore it can't be changed.