Ubuntu 8.04 will reach it's end-of-life on May 12 2011

Ubuntu announced its 8.04 Desktop release almost 36 months ago, on April
24, 2008. For the LTS Desktop releases, Ubuntu committed to ongoing
security and critical fixes for a period of 36 months. The support
period is now nearing its end and Ubuntu 8.04 Desktop will reach end of
life on Thursday, May 12, 2011. At that time, Ubuntu Security Notices
will no longer include information or updated packages for Ubuntu 8.04
Desktop.

The supported upgrade path from Ubuntu 8.04 Desktop is via Ubuntu 10.04
Desktop. Instructions and caveats for the upgrade may be found at
https://help.ubuntu.com/community/LucidUpgrades. Ubuntu 8.04 Server
continues to be actively supported with security updates and
select high-impact bug fixes. All announcements of official security
updates for Ubuntu releases are sent to the ubuntu-security-announce
mailing list, information about which may be found at
https://lists.ubuntu.com/mailman/listinfo/ubuntu-security-announce

Since its launch in October 2004 Ubuntu has become one of the most
highly regarded Linux distributions with millions of users in homes,
schools, businesses and governments around the world. Ubuntu is Open
Source software, costs nothing to download, and users are free to
customise or alter their software in order to meet their needs.

Kate Stewart
Ubuntu Release Manager