Natty Narwhal is the Ubuntu codename for version 11.04 of the Ubuntu Linux-based operating system. Officially released in April 2011, Natty Narwhal served as a major update for Ubuntu, with the new Unity interface becoming the default desktop interface, numerous key additions to the Unity app launcher, and several significant default app changes, including Mozilla Firefox 4 as the default Web browser, LibreOffice as the default office suite (replacing OpenOffice.org) and Banshee 2.0 replacing Rhythmbox as the standard music player.
Natty means "neat and tidy," and the narwhal is a toothed whale found in the Artic that's particularly well known for the male narwhal's unicorn-like tusk. Natty Narwhal followed the Maverick Meerkat (v11.04) release of Ubuntu and was succeeded by Oneiric Ocelot (v11.10) in October 2011.
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