Ubuntu 11.04 (Natty Narwhal) Alpha 3 released and download links included
The Ubuntu developers are moving quickly to bring you the absolute latest and greatest software the Open Source community has to offer. The Natty Narwhal Alpha 3 Release of Ubuntu 11.04, is a developer snapshot to give you an early glance at the next version of Ubuntu.
Upgrading from Ubuntu 10.10 to ubuntu 11.04
To upgrade from Ubuntu 10.10 on a desktop system, press Alt+F2 and type in "update-manager -d" (without the quotes) into the command box. Update Manager should open up and tell you: New distribution release ‘11.04' is available. Click Upgrade and follow the on-screen instructions.
To upgrade from Ubuntu 10.10 on a server system: install the update-manager-core package if it is not already installed; launch the upgrade tool with the command sudo do-release-upgrade -d; and follow the on-screen instructions. Note that the server upgrade is now more robust and will utilize GNU screen and automatically re-attach in case of e.g. dropped connection problems.
To upgrade from Xubuntu 10.10, follow the instructions above for Ubuntu 10.10.
Download the Alpha 3
This release is for developers only.
http://cdimage.ubuntu.com/releases/natty/alpha-3/ (Ubuntu Desktop and Server)
http://uec-images.ubuntu.com/releases/natty/alpha-3/ (Ubuntu Server for UEC and EC2)
http://cdimage.ubuntu.com/ubuntu-netbook/releases/natty/alpha-3/ (Ubuntu Netbook ARM)
http://cdimage.ubuntu.com/edubuntu/releases/natty/alpha-3/ (Edubuntu DVD)
http://cdimage.ubuntu.com/ubuntustudio/releases/natty/alpha-3/ (Ubuntu Studio)