Ubuntu is a widely used desktop OS, which uses the Linux kernel, but its server release is getting quite popular too. The reason is that the OS is really light and it will function on almost any hardware with no issues, utilizing its resources to the maximum. Ubuntu is also pretty reliable and secure and all the Long-Term Support (LTS) editions are supported for at least five years, which warrants that you will have a secure and stable software environment on your server all of the time. Also, Ubuntu has one of the largest user communities globally, which means that if you experience any problem or have any question, you will find a number of resources on the Internet. Among the key advantages of this Operating System is that it includes numerous software packages that can be freely modified in accordance with your needs as well as the requirements of the applications which you want to run, not to mention that you won't have to pay any license fees any time. In comparison, other OS's are paid and their program code is not accessible, which means that it can't be changed.