Oneiric Ocelot is the Ubuntu codename for version 11.10 of the Ubuntu Linux-based operating system. Officially released in October 2011, Oneiric Ocelot’s updates included an improved Dash, additional refinements to the Unity interface introduced in Natty Narwhal, an overhauled Ubuntu Software Center, a new login screen, the inclusion of Mozilla Thunderbird as the default mail client and more.
Oneiric means “dreamy,” and the ocelot is a domestic-sized cat native to South and Central America. Oneiric Ocelot followed the Natty Narwhal (v11.04) release of Ubuntu and will be succeeded by Precise Pangolin in 2012.