Ubuntu 4.10 Warty Warthog
Ubuntu 5.04 Hoary Hedgehog
Ubuntu 5.10 Breezy Badger
Ubuntu 6.06 LTS Dapper Drake
Ubuntu 6.10 Edgy Eft
Ubuntu 7.04 Feisty Fawn
Ubuntu 7.10 Gusty Gibbon
Ubuntu 8.04 LTS Hardy Heron
Ubunut 8.10 Intrepid Ibex
Ubuntu 9.04 Jaunty Jackalope
Ubuntu 9.10 karmic kola
Ubuntu 1.04 lucid linx
Refaance:-http://jaqoup.wordpress.com/2009/08/12/ubuntu-code-names/