Ubuntu is a well known desktop OS, which uses the Linux kernel, but its server release is getting pretty popular as well. The reason is that the operating system is very light and it will function on almost any hardware without issues, utilizing its resources to the maximum. Ubuntu is also extremely 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 secure and stable software environment on your web hosting server all of the time. Furthermore, Ubuntu has one of the biggest user communities in the world, so if you experience any kind of problem or have any question, you will find lots of resources online. Among the main advantages of this Operating System is that it includes numerous software packages that can be freely modified according to your needs as well as the requirements of the apps which you'd like to run, not to mention that you will not have to pay any kind of license fees at any time. In comparison, other OS's are paid and their program code isn't accessible, thus it cannot be changed.