Ubuntu is a really popular Operating System, that employs the Linux kernel. Even though it is used primarily on personal computers, its server version has been rising in popularity nowadays as well. Ubuntu is one of the lightest Linux releases out there and it supports almost any kind of hardware, which makes it a universal OS. In addition, it is very stable and secure and has an at least a 5-year support life cycle, so you can receive official protection and performance updates. Unlike many other OS's, Ubuntu is distributed with no license fees and you will be able to modify its core, and any of the numerous packages it contains, in any way you find fit. This enables you to set up the proper software environment for your web apps irrespective of their specifications. As a result of the popularity of the OS, Ubuntu has large developer and user communities, so you'll always find find a lot of materials on the world wide web related to any question or problem which you might have.