Ubuntu is a widespread desktop Operating System, which uses the Linux kernel, but its server edition is getting pretty popular as well. The reason is that the OS is amazingly light and it can run on almost any kind of hardware with no issues, utilizing its resources to the maximum. Ubuntu is also really reliable and secure and all the Long-Term Support (LTS) releases are supported for a minimum of 5 years, which warrants that you will have a secure and stable software environment on your hosting server all of the time. Furthermore, Ubuntu has one of the largest user communities on the planet, so if you experience any issue or have any kind of question, you will find plenty of resources on the web. Among the key benefits of this OS is that it includes a large number of software packages that can be freely changed according to your needs and / or the requirements of the applications that you need to run, not to mention that you will not have to pay any license fees at any time. In comparison, other Operating Systems are paid and their program code is not accessible, thus it can't be changed.