Ubuntu is a popular desktop OS, which uses the Linux kernel, and its server edition is getting very popular as well. The reason is the fact that the operating system is amazingly light and it can function on almost any hardware with no issues, utilizing its resources to the max. Ubuntu is also really reliable and secure and all Long-Term Support (LTS) editions are supported for a minimum of 5 years, which guarantees that you should have a safe and stable software environment on your hosting server all the time. Also, Ubuntu has one of the biggest user communities around the world, which means that if you experience any issue or have any kind of question, you'll discover a number of resources on the net. One of the major advantages of this OS is that it features a great number of software packages which can be freely changed according to your needs as well as the needs of the apps that you want to run, not to mention that you won't have to pay any kind of license fees at any time. In contrast, other OS's are paid and their program code isn't accessible, therefore it can't be changed.