Ubuntu is an exceptionally popular Operating System, that employs the Linux kernel. Though it's used primarily on personal computers, its server version has been becoming more popular these days as well. Ubuntu is one of the lightest Linux releases you can get and it's compatible with almost any hardware, which makes it a universal Operating System. In addition, it is very stable and secure and has an no less than a 5-year support life cycle, so you'll be able to get official security and performance updates. Unlike a number of other OS's, Ubuntu is distributed with no license fees and you are able to customize its core, and / or any of the thousands of packages it contains, in any way you find fit. This will allow you to set up the optimal software environment for all your web apps irrespective of their specifications. Due to the popularity of the OS, Ubuntu has large developer and user communities, which means that you'll always find find lots of materials on the Internet about any question or problem which you may have.