Ubuntu is a community developed, linux-based operating system that is perfect for laptops, desktops and servers. It contains all the applications you need – a web browser, presentation, document and spreadsheet software, instant messaging and much more. The main Ubuntu uses the Gnome desktop, Kubuntu uses the KDE desktop and Xubuntu uses the Xfce deskstop, and is also suited for older computers. The best about all this: it’s free, and there’s a huge community out there waiting to help you in case you run into problems.