You may find more info about Ubuntu releases and EoL dates at https://wiki.ubuntu.com/Releases*
Ubuntu 6.06 (Dapper Drake) reaches end-of-life on June 1 2011* Ubuntu announced its 6.06 Server release almost 5 years ago, on June 1, > 2006. For the LTS Server releases, Ubuntu committed to ongoing > security and critical fixes for a period of 5 years. The support > period is now nearing its end and Ubuntu 6.06 LTS Server will reach > end of life on Wednesday, June 1, 2011. At that time, Ubuntu Security > Notices will no longer include information or updated packages for > Ubuntu 6.06. > > The supported upgrade path from Ubuntu 6.06 LTS Server is via > Ubuntu 8.04 LTS Server. Instructions and caveats for the upgrade may > be found at https://help.ubuntu.com/community/HardyUpgrades. > For further Ubuntu support, including commercial support options, see > http://www.ubuntu.com/support. > > Ubuntu 8.04 LTS 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 > *Ubuntu 8.04 reaches 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 >