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The Ubuntu team is pleased to announce Ubuntu 8.10 Desktop and Server,
continuing Ubuntu’s tradition of integrating the latest and greatest open
source technologies into a high-quality, easy-to-use Linux distribution.

Read more about the features of Ubuntu 8.10 in the following press releases:

Desktop edition http://www.ubuntu.com/news/ubuntu-8.10-desktop
Server edition http://www.ubuntu.com/news/ubuntu-8.10-server

Get your copy now from : http://www.ubuntu.com/getubuntu

For users wanted to automatic upgrade, read below quote from ubuntu:

Because Ubuntu 8.04 LTS is a long-term support release, users of that
release will not be offered an automatic upgrade to 8.10 via Update Manager.
For instructions on upgrading to Ubuntu 8.10, see:

http://www.ubuntu.com/getubuntu/upgrading