Ubuntu is a widespread desktop Operating System, which uses the Linux kernel, and its server release is getting pretty popular as well. The reason is that the OS is really light and it will function on almost any kind of hardware without issues, utilizing its resources to the max. Ubuntu is also extremely reliable and secure and all Long-Term Support (LTS) editions are supported for a minimum of 5 years, which warrants that you will have a protected and stable software environment on your website hosting server at all times. Furthermore, Ubuntu has one of the largest user communities around the world, which means that if you experience any problem or have any kind of question, you'll find a number of resources online. One of the main advantages of this OS is that it has a large number of software packages which can be freely changed according to your needs as well as the requirements of the apps which you want to run, not to mention that you won't have to pay any license fees at all. In contrast, other OS's are paid and their program code is not accessible, which means that it can't be changed.