http://en.wikipedia.org/wiki/Ubuntu_%28operating_system%29 Everpad for Linux, including Ubuntu.[22][23][24] Ubuntu is built on Debian‘s architecture and infrastructure, to provide Linux server, desktop, phone, tablet and TV operating systems.[27] Ubuntu releases updated versions predictably – every six months[11] – and each release receives free support for nine months (eighteen months prior to 13.04)[28] with security fixes, high-impact bug fixes and conservative, substantially beneficial low-risk bug fixes.[29] The first release was in October 2004.