首先，本文所指的Ubuntu 9.04是指的Jaunty Jackalope版本，目前是一個開發版本，帶來的變化可能和Ubuntu 8.10正式版區別不大。不過後期的話，9.04的很多新熱性會不斷發布到新版本中來，你通過更新系統就可以跟著Ubuntu 9.04走了，有興趣的朋友可以試試，不過中間可能會由於BUG出現很多不正常的情況，你可要想清楚，想要有所收獲就必然要有所付出。
加入Ubuntu 9.04(Jaunty Jackalope)源直接升級就可以：
deb http://archive.ubuntu.com/ubuntu/ jaunty main restricted universe multiverse
deb http://archive.ubuntu.com/ubuntu/ jaunty-security main restricted universe multiverse
deb http://archive.ubuntu.com/ubuntu/ jaunty-updates main restricted universe multiverse
deb http://archive.ubuntu.com/ubuntu/ jaunty-proposed main restricted universe multiverse
deb http://archive.ubuntu.com/ubuntu/ jaunty-backports main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu/ jaunty main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu/ jaunty-security main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu/ jaunty-updates main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu/ jaunty-proposed main restricted universe multiverse
deb-src http://archive.ubuntu.com/ubuntu/ jaunty-backports main restricted universe multiverse
