Ubuntu 10.04 (Lucid Lynx) was first announced at the Atlanta Linux Fest by Shuttleworth on 19 September 2009, and was released on 29 April 2010. Support for Ubuntu 10.04 will be provided by Canonical until April 2013 for the desktop version and April 2015 for the server version. The same dates apply to Kubuntu 10.04, which is built on KDE.
The new release includes, among other things, improved support for Nvidia proprietary graphics drivers, while switching to the open source Nvidia graphics driver, nouveau, by default.
GIMP was removed from the Lucid installation CD due to its professional-grade complexity and its file size. F-Spot provides normal user level graphics editing capabilities and GIMP remains available for download in the repositories.
The distribution emphasises the new importance of web services and social networking with integrated interfaces for posting to sites like Facebook and Twitter, complementing the IM and email integration already in Ubuntu.
Download it here
* Source : http://en.wikipedia.org/wiki/Ubuntu_10.04