Ubuntu is a widely used desktop Operating System, which uses the Linux kernel, but its server release is getting pretty popular as well. The main reason is the fact that the OS is extremely light and it'll run on almost any hardware without any issues, utilizing its resources to the max. Ubuntu is also very reliable and secure and all the Long-Term Support (LTS) versions are supported for at least 5 years, which warrants that you will have a secure and dependable software environment on your server all the time. In addition, Ubuntu has one of the largest user communities on the planet, which means that if you experience any problem or have any kind of question, you will discover plenty of resources online. Among the major advantages of this OS is the fact that it contains a great number of software packages which can be freely changed in accordance with your needs as well as the needs of the applications that you'd like to run, not to mention that you will not have to pay any license fees at any time. In contrast, other OS's are paid and their program code is not accessible, which means that it can't be changed.