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 is the reference OS for OpenStack. Canonical’s OpenStack Autopilot is a fully automated deployment of an OpenStack cloud on Ubuntu — just add servers.
Created specifically for the needs of Chinese users, Ubuntu Kylin 14.04.3 LTS includes many unique features and five years support from Canonical.
Are you a developer who wants to try snappy Ubuntu Core? The new, transactionally updated Ubuntu for clouds and devices.
There are several other ways to get Ubuntu including torrents, which can potentially mean a quicker download, our network installer for older systems and special configurations and links to our regional DVD image mirrors for our older releases.
Ubuntu flavours offer a unique way to experience Ubuntu with
different choices of default applications and settings, backed
by the full Ubuntu archive for packages and updates.
Learn more about Ubuntu Advantage with Landscape.
Ubuntu Advantage ›
Ubuntu Server Guide
Ubuntu 14.04 LTS Documentation
View Ubuntu’s md5 hashes
If you get stuck, help is always at hand.