That's right, Linux fans – a new version of Ubuntu is due out today.
If you already have Ubuntu, your system should tell you when the update is available. If not, launch the update manager in Ubuntu and it will search for the new operating system for you.
If you simply want to switch to Ubuntu, head over to Ubuntu.com, hit the download tab and follow the directions. Bear in mind that you can have Ubuntu running alongside your current operating system or you can put it on a USB drive or DVD so you can test drive it instead of installing it on your system.