Ubuntu

Ubuntu is an exceptionally popular Operating System, which makes use of the Linux kernel. Even though it's used mainly on desktop machines, its server version has been rising in popularity these days as well. Ubuntu is one of the lightest Linux distributions available and it supports almost any kind of hardware, which makes it a universal Operating System. In addition, it is very stable and secure and has an at the very least a 5-year support life cycle, so you can get official security and performance updates. Unlike alternative OS's, Ubuntu is distributed without any license fees and you will be able to customize its core, as well as all of the countless packages it contains, in any way you find fit. This will enable you to install the proper software environment for your web apps whatever their requirements. Due to the popularity of the Operating System, Ubuntu has vast developer and user communities, which means that you can always find lots of materials on the web about any question or problem which you may have.