Welcome to Lucid Lynx Alpha 2, which will in time become Ubuntu 10.04 LTS.
Pre-releases of Lucid are *not* encouraged for anyone needing a stable system or anyone who is not comfortable running into occasional, even frequent breakage. They are, however, recommended for Ubuntu developers and those who want to help in testing, reporting, and fixing bugs.
Alpha 2 is the second in a series of milestone CD images that will be released throughout the Lucid development cycle. The Alpha images are known to be reasonably free of showstopper CD build or installer bugs, while representing a very recent snapshot of Lucid. You can download it here:
http://uec-images.ubuntu.com/releases/lucid/alpha-2/ (Ubuntu Server for UEC and EC2)
http://cdimage.ubuntu.com/ports/releases/lucid/alpha-2/ (Ubuntu ARM)
See http://wiki.ubuntu.com/Mirrors for a list of mirrors.
Alpha 2 includes a number of software updates that are ready for wider testing. Please refer to http://www.ubuntu.com/testing/lucid/alpha2 for information on changes in Ubuntu.
This is quite an early set of images, so you should expect some bugs. For a list of known bugs (that you don't need to report if you encounter), please see: