The current release is 9.04 "Jaunty Jackalope." The next release, "Karmic Koala", will be released sometime in October.
As of November October 13, 2011, the latest stable release is Ubuntu 11.10 "Oneiric Ocelot".
Ubuntu - 2009 was released on: USA: October 2009
Ubuntu releases are versioned based on their release date in a generally 6-month cycle.The format is: YY.MM.By this format, Ubuntu 10.04 was released in April 2010.
Ubuntu uses many file formats, many of which are shared with Windows and Macintosh. The partition format the Ubuntu generally uses is an ext4 filesystem.
ten or more years of development depending on your version of Ubuntu. Ubuntu is a modern Linux distribution while windows 95 is an aging and unsupported parent of the current windows environment.
Ubuntu - 2012 was released on: USA: 1 May 2012 (Film Outside the Frame Festival)
Ubuntu Linux is officially supported on the x86 and AMD64-based processors, and unofficial support is available for Intel IA-64, and PowerPC.
Ubuntu - 2011 III was released on: USA: 28 January 2012 (San Diego Black Film Festival)
Noble Exchange - 2010 Ubuntu 1-5 was released on: USA: June 2010
Ubuntu is an OS that works a lot like Windows. The Wiki is actually information on how to get involved in the project and its release schedule for the future.
It is scheduled for release on the 29th of April of 2010.
Xubuntu and Ubuntu are two different versions of Ubuntu. (Ubuntu has GNOME.)