Ubuntu is a very popular Operating System, that uses the Linux kernel. Although it is used primarily on personal computers, its server version has been rising in popularity recently as well. Ubuntu is one of the lightest Linux releases available and it supports almost any kind of hardware, that makes it a universal OS. It is also very stable and secure and has an a minimum of a 5-year support life cycle, so you're able to get official security and performance updates. Unlike lots of other OS's, Ubuntu is distributed with no license fees and you'll be able to modify its core, and any of the thousands of packages it contains, in any way you see fit. This allows you to set up the ideal software environment for all of your web apps whatever their specifications. As a result of the popularity of the OS, Ubuntu has large developer and user communities, so that you'll always find find lots of materials online related to any question or problem that you might have.