Ubuntu 8.04.1 i386 Alternate CD is the first maintenance release of Ubuntu 8.04 LTS, which continues to be supported with maintenance updates and security fixes until April 2011 on desktops and April 2013 on servers.
About Ubuntu
Ubuntu is a computer operating system based on the Debian GNU/Linux distribution. It is named after the Southern African ethical ideology Ubuntu ("humanity towards others")and is distributed as free and open source software with additional proprietary software available. Ubuntu provides an up-to-date, stable operating system for the average user, with a strong focus on usability and ease of installation. Web statistics from late 2009 suggest that Ubuntu's share of Linux desktop usage is between 40 and 50%.