Ubuntu is a very popular OS, which uses the Linux kernel. Although it's used primarily on desktop machines, its server version has been becoming more popular nowadays as well. Ubuntu is among the lightest Linux releases available and it supports almost any hardware, which makes it a universal Operating System. It's also very stable and secure and has an at least a 5-year support life cycle, so you can get official protection and performance updates. Unlike alternative Operating Systems, Ubuntu is distributed without any license fees and you will be able to customize its core, as well as all of the numerous packages it comes with, in any way you see fit. This enables you to set up the right software environment for your web apps irrespective of their specifications. Because of the popularity of the OS, Ubuntu has huge developer and user communities, so that you will always find numerous materials on the web related to any question or problem which you may have.