There are a lot of Linux distributions that have the primary focus of becoming the next best desktop replacement for Windows or OS X. Canonical’s UBUNTU is the great and most contentious group of distro which offers 4 kinds of desktop and special edition for laptops and Live Distros. you can download ubuntu from the following link Download.
Ubuntu edges out its closest contenders, Fedora and openSUSE, because its development team is constantly focused on the end-user experience. Canonical and the Ubuntu community have spent a lot of time and resources on bringing ease-of-use tools to this distribution, particularly in the area of installing Ubuntu and installing applications within Ubuntu.
In addition, Ubuntu’s level of support for its desktop products is highly superior, which is important in this class of distributions since it is the most likely to contain users new to Linux. Both the official and unofficial Ubuntu documentation is robust and searchable, a big plus.