Codenamed "Natty Narwhal", 11.04 continues Ubuntu's proud tradition of integrating the latest and greatest open source technologies into a high-quality, easy-to-use Linux distribution.

Ubuntu 11.04 now combines Ubuntu Desktop Edition and Ubuntu Netbook Edition. This edition introduces the Unity environment as the default desktop.

Ubuntu 11.04 Netbook edition will still be produced for the ARM platform, and the team is proud to introduce a Headless edition with 11.04 for ARM.

Ubuntu 11.04 Server has made it easier to provision servers, and reduce power consumption.

Ubuntu 11.04 Server for EC2 is available as well, with a new kernel and improved initialization and configuration options.

The Ubuntu 11.04 family of Kubuntu, Xubuntu, Edubuntu, Mythbuntu, and Ubuntu Studio, also reach beta status today.[

http://releases.ubuntu.com/natty/ (Ubuntu, Ubuntu Server)
http://cdimage.ubuntu.com/releases/natty/beta-2/ (Ubuntu DVD, source)
http://uec-images.ubuntu.com/releases/natty/beta-2/ (Ubuntu Server EC2)
http://cdimage.ubuntu.com/ubuntu-netbook/releases/natty/beta-2/ (Ubuntu Netbook ARM)
http://cdimage.ubuntu.com/netboot/11.04/beta-2/ (Ubuntu Netboot)
http://releases.ubuntu.com/kubuntu/natty/ (Kubuntu)
http://cdimage.ubuntu.com/kubuntu/releases/natty/beta-2/ (Kubuntu DVD, preinstalled ARM images)
http://cdimage.ubuntu.com/xubuntu/releases/natty/beta-2/ (Xubuntu)
http://cdimage.ubuntu.com/edubuntu/releases/natty/beta-2/ (Edubuntu)
http://cdimage.ubuntu.com/ubuntustudio/releases/natty/beta-2/ (Ubuntu Studio)
http://cdimage.ubuntu.com/mythbuntu/releases/natty/beta-2/ (Mythbuntu)