Ubuntu LTS is (Long Term Support) which continues to be supported with maintenance updates and security fixes until June 2009 on desktops and June 2011 on servers.
Download Link is h3r3 for i386 (from Ubuntu Official Site)
Download Link is h3r3 for AMD64 (from Ubuntu Official Site)
MD5 Checksum is h3r3
Official Announcement from Canoncial (The commercial Supporter of Ubuntu) is h3r3