Ubuntu Alpha releases contains a lot of bugs, so is recommended to install on a test machine or a virtual space. Here we are with the second Alpha of Ubuntu and thats include Ubuntu GNOME, Lubuntu, Kubuntu, and the Ubuntu Kylin(China OS).
Your system must have at least 384MiB of RAM. You can use the Intel x86 images. Download the .iso file from below and burn it on a CD/DVD or you can mount on a virtual machine.