Ubuntu is completely free to download, use and share.
Download Ubuntu desktop and replace your current operating system whether it’s Windows or Mac OS, or, run Ubuntu alongside it.
Do you want to upgrade? Follow our simple guide ›
Whether you want to configure a simple file server or build a fifty thousand-node cloud, you can rely on Ubuntu Server and its five years of guaranteed free upgrades.
Ubuntu OpenStack enables you to provision your servers and build an OpenStack cloud on Ubuntu, all from one Ubuntu Server download.
Created specifically for the needs of Chinese users, Ubuntu Kylin 14.04.3 LTS includes many unique features and five years support from Canonical.
Ubuntu is available via BitTorrent links and regional mirrors. You can also use the network installer.
Learn more about management with Landscape.
Ubuntu Advantage ›
Ubuntu OpenStack is the fastest way to build an enterprise-scale cloud.
Ubuntu OpenStack ›
If you get stuck, help is always at hand.