Ubuntu 9.04馬上就要發布了，你是否想現在就把Ubuntu 8.10升級到9.04呢，那就跟我來吧。
打開終端，輸入第一條命令(見圖1)
sudo gedit /etc/apt/sources.list
圖1
編輯你的源列表，添加最後列表中你覺得適合你的，復制到你的列表中，然後保存列表。
第二條命令(見圖2)
sudo apt-get update
更新源列表信息
圖2
第三條命令sudo update-manager -d
或者直接見圖3打開更新管理器
圖3
最後點擊升級
發行版升級
此後就是漫長的等待，選擇好的源很重要，會節省很多下載的時間，下載完後配置新的系統，重啟系統，就是9.04了。
如果你迫不及待想體驗的話，那就按照本文開始吧！Just do it!
享受開源，享受Ubuntu！
源列表Ubuntu 9.04
Archive.ubuntu.com更新服務器（歐洲，此為官方源，電信網通用戶使用)：
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
網易163更新服務器：
deb http://mirrors.163.com/ubuntu/ jaunty main restricted universe multiverse
deb http://mirrors.163.com/ubuntu/ jaunty-security main restricted universe multiverse
deb http://mirrors.163.com/ubuntu/ jaunty-updates main restricted universe multiverse
deb http://mirrors.163.com/ubuntu/ jaunty-proposed main restricted universe multiverse
deb http://mirrors.163.com/ubuntu/ jaunty-backports main restricted universe multiverse
deb-src http://mirrors.163.com/ubuntu/ jaunty main restricted universe multiverse
deb-src http://mirrors.163.com/ubuntu/ jaunty-security main restricted universe multiverse
deb-src http://mirrors.163.com/ubuntu/ jaunty-updates main restricted universe multiverse
deb-src http://mirrors.163.com/ubuntu/ jaunty-proposed main restricted universe multiverse
deb-src http://mirrors.163.com/ubuntu/ jaunty-backports main restricted universe multiverse
Mirrors.shlug.org更新服務器（電信服務器，Ubuntu China Official Mirror, maintained by Shanghai Linux User Group）：
deb http://cn.archive.ubuntu.com/ubuntu jaunty main restricted universe multiverse
deb http://cn.archive.ubuntu.com/ubuntu jaunty-security main restricted universe multiverse
deb http://cn.archive.ubuntu.com/ubuntu jaunty-updates main restricted universe multiverse
deb http://cn.archive.ubuntu.com/ubuntu jaunty-backports main restricted universe multiverse
deb http://cn.archive.ubuntu.com/ubuntu jaunty-proposed main restricted universe multiverse
deb-src http://cn.archive.ubuntu.com/ubuntu jaunty main restricted universe multiverse
deb-src http://cn.archive.ubuntu.com/ubuntu jaunty-security main restricted universe multiverse
deb-src http://cn.archive.ubuntu.com/ubuntu jaunty-updates main restricted universe multiverse
deb-src http://cn.archive.ubuntu.com/ubuntu jaunty-backports main restricted universe multiverse
deb-src http://cn.archive.ubuntu.com/ubuntu jaunty-proposed main restricted universe multiverse
Mirror.lupaworld.com更新服務器（浙江省杭州市雙線服務器，推薦）：
deb http://mirror.lupaworld.com/ubuntu jaunty main restricted universe multiverse
deb http://mirror.lupaworld.com/ubuntu jaunty-security main restricted universe multiverse
deb http://mirror.lupaworld.com/ubuntu jaunty-updates main restricted universe multiverse
deb http://mirror.lupaworld.com/ubuntu jaunty-backports main restricted universe multiverse
deb http://mirror.lupaworld.com/ubuntu jaunty-proposed main restricted universe multiverse
deb-src http://mirror.lupaworld.com/ubuntu jaunty main restricted universe multiverse
deb-src http://mirror.lupaworld.com/ubuntu jaunty-security main restricted universe multiverse
deb-src http://mirror.lupaworld.com/ubuntu jaunty-updates main restricted universe multiverse
deb-src http://mirror.lupaworld.com/ubuntu jaunty-backports main restricted universe multiverse
deb-src http://mirror.lupaworld.com/ubuntu jaunty-proposed main restricted universe multiverse
廈門大學更新服務器（教育網服務器）：
deb ftp://ubuntu.realss.cn/ubuntu/ jaunty main restricted universe multiverse
deb ftp://ubuntu.realss.cn/ubuntu/ jaunty-backports restricted universe multiverse
deb ftp://ubuntu.realss.cn/ubuntu/ jaunty-proposed main restricted universe multiverse
deb ftp://ubuntu.realss.cn/ubuntu/ jaunty-security main restricted universe multiverse
deb ftp://ubuntu.realss.cn/ubuntu/ jaunty-updates main restricted universe multiverse
deb-src ftp://ubuntu.realss.cn/ubuntu/ jaunty main restricted universe multiverse
deb-src ftp://ubuntu.realss.cn/ubuntu/ jaunty-backports main restricted universe multiverse
deb-src ftp://ubuntu.realss.cn/ubuntu/ jaunty-proposed main restricted universe multiverse
deb-src ftp://ubuntu.realss.cn/ubuntu/ jaunty-security main restricted universe multiverse
deb-src ftp://ubuntu.realss.cn/ubuntu/ jaunty-updates main restricted universe multiverse
成都市 電子科技大學更新服務器（教育網，推薦校園網和網通用戶使用）：
deb http://ubuntu.uestc.edu.cn/ubuntu/ jaunty main multiverse restricted universe
deb http://ubuntu.uestc.edu.cn/ubuntu/ jaunty-backports main multiverse restricted universe
deb http://ubuntu.uestc.edu.cn/ubuntu/ jaunty-proposed main multiverse restricted universe
deb http://ubuntu.uestc.edu.cn/ubuntu/ jaunty-security main multiverse restricted universe
deb http://ubuntu.uestc.edu.cn/ubuntu/ jaunty-updates main multiverse restricted universe
deb-src http://ubuntu.uestc.edu.cn/ubuntu/ jaunty main multiverse restricted universe
deb-src http://ubuntu.uestc.edu.cn/ubuntu/ jaunty-backports main multiverse restricted universe
deb-src http://ubuntu.uestc.edu.cn/ubuntu/ jaunty-proposed main multiverse restricted universe
deb-src http://ubuntu.uestc.edu.cn/ubuntu/ jaunty-security main multiverse restricted universe
deb-src http://ubuntu.uestc.edu.cn/ubuntu/ jaunty-updates main multiverse restricted universe
== 如果無法解析uestc.edu.cn域名，請使用以下地址 ==
deb http://ubuntu.dormforce.net/ubuntu/ jaunty main multiverse restricted universe
deb http://ubuntu.dormforce.net/ubuntu/ jaunty-backports main multiverse restricted universe
deb http://ubuntu.dormforce.net/ubuntu/ jaunty-proposed main multiverse restricted universe
deb http://ubuntu.dormforce.net/ubuntu/ jaunty-security main multiverse restricted universe
deb http://ubuntu.dormforce.net/ubuntu/ jaunty-updates main multiverse restricted universe
deb-src http://ubuntu.dormforce.net/ubuntu/ jaunty main multiverse restricted universe
deb-src http://ubuntu.dormforce.net/ubuntu/ jaunty-backports main multiverse restricted universe
deb-src http://ubuntu.dormforce.net/ubuntu/ jaunty-proposed main multiverse restricted universe
deb-src http://ubuntu.dormforce.net/ubuntu/ jaunty-security main multiverse restricted universe
deb-src http://ubuntu.dormforce.net/ubuntu/ jaunty-updates main multiverse restricted universe
上海市上海交通大學更新服務器（教育網，推薦校園網和網通用戶使用）：
deb http://ftp.sjtu.edu.cn/ubuntu/ jaunty main multiverse restricted universe
deb http://ftp.sjtu.edu.cn/ubuntu/ jaunty-backports main multiverse restricted universe
deb http://ftp.sjtu.edu.cn/ubuntu/ jaunty-proposed main multiverse restricted universe
deb http://ftp.sjtu.edu.cn/ubuntu/ jaunty-security main multiverse restricted universe
deb http://ftp.sjtu.edu.cn/ubuntu/ jaunty-updates main multiverse restricted universe
deb-src http://ftp.sjtu.edu.cn/ubuntu/ jaunty main multiverse restricted universe
deb-src http://ftp.sjtu.edu.cn/ubuntu/ jaunty-backports main multiverse restricted universe
deb-src http://ftp.sjtu.edu.cn/ubuntu/ jaunty-proposed main multiverse restricted universe
deb-src http://ftp.sjtu.edu.cn/ubuntu/ jaunty-security main multiverse restricted universe
deb-src http://ftp.sjtu.edu.cn/ubuntu/ jaunty-updates main multiverse restricted universe
中國科學技術大學更新服務器（教育網，推薦校園網和網通用戶使用）：
deb http://debian.ustc.edu.cn/ubuntu/ jaunty main multiverse restricted universe
deb http://debian.ustc.edu.cn/ubuntu/ jaunty-backports main multiverse restricted universe
deb http://debian.ustc.edu.cn/ubuntu/ jaunty-proposed main multiverse restricted universe
deb http://debian.ustc.edu.cn/ubuntu/ jaunty-security main multiverse restricted universe
deb http://debian.ustc.edu.cn/ubuntu/ jaunty-updates main multiverse restricted universe
deb-src http://debian.ustc.edu.cn/ubuntu/ jaunty main multiverse restricted universe
deb-src http://debian.ustc.edu.cn/ubuntu/ jaunty-backports main multiverse restricted universe
deb-src http://debian.ustc.edu.cn/ubuntu/ jaunty-proposed main multiverse restricted universe
deb-src http://debian.ustc.edu.cn/ubuntu/ jaunty-security main multiverse restricted universe
deb-src http://debian.ustc.edu.cn/ubuntu/ jaunty-updates main multiverse restricted universe
中國台灣 台灣大學更新服務器（推薦網通用戶使用，電信PING平均響應速度41MS。強烈推薦此源，比較完整，較少出現同步問題）：
deb http://ubuntu.csie.ntu.edu.tw/ubuntu/ jaunty main restricted universe multiverse
deb-src http://ubuntu.csie.ntu.edu.tw/ubuntu/ jaunty main restricted universe multiverse
deb http://ubuntu.csie.ntu.edu.tw/ubuntu/ jaunty-updates main restricted universe multiverse
deb-src http://ubuntu.csie.ntu.edu.tw/ubuntu/ jaunty-updates main restricted universe multiverse
deb http://ubuntu.csie.ntu.edu.tw/ubuntu/ jaunty-backports main restricted universe multiverse
deb-src http://ubuntu.csie.ntu.edu.tw/ubuntu/ jaunty-backports main restricted universe multiverse
deb http://ubuntu.csie.ntu.edu.tw/ubuntu/ jaunty-security main restricted universe multiverse
deb-src http://ubuntu.csie.ntu.edu.tw/ubuntu/ jaunty-security main restricted universe multiverse
deb http://ubuntu.csie.ntu.edu.tw/ubuntu/ jaunty-proposed main multiverse restricted universe
deb-src http://ubuntu.csie.ntu.edu.tw/ubuntu/ jaunty-proposed main restricted universe multiverse
mirror.rootguide.org更新服務器（上海市 電信）：
deb http://mirror.rootguide.org/ubuntu/ jaunty main restricted universe multiverse
deb-src http://mirror.rootguide.org/ubuntu/ jaunty main restricted universe multiverse
deb http://mirror.rootguide.org/ubuntu/ jaunty-updates main restricted universe multiverse
deb-src http://mirror.rootguide.org/ubuntu/ jaunty-updates main restricted universe multiverse
deb http://mirror.rootguide.org/ubuntu/ jaunty-backports main restricted universe multiverse
deb-src http://mirror.rootguide.org/ubuntu/ jaunty-backports main restricted universe multiverse
deb http://mirror.rootguide.org/ubuntu/ jaunty-security main restricted universe multiverse
deb-src http://mirror.rootguide.org/ubuntu/ jaunty-security main restricted universe multiverse
deb http://mirror.rootguide.org/ubuntu/ jaunty-proposed main multiverse restricted universe
deb-src http://mirror.rootguide.org/ubuntu/ jaunty-proposed main restricted universe multiverse
台灣的官方源速度也相當不錯，有時甚至快於內地的：
deb http://tw.archive.ubuntu.com/ubuntu jaunty main restricted universe multiverse
deb http://tw.archive.ubuntu.com/ubuntu jaunty-security main restricted universe multiverse
deb http://tw.archive.ubuntu.com/ubuntu jaunty-updates main restricted universe multiverse
deb http://tw.archive.ubuntu.com/ubuntu jaunty-backports main restricted universe multiverse
deb http://tw.archive.ubuntu.com/ubuntu jaunty-proposed main restricted universe multiverse
deb-src http://tw.archive.ubuntu.com/ubuntu jaunty main restricted universe multiverse
deb-src http://tw.archive.ubuntu.com/ubuntu jaunty-security main restricted universe multiverse
deb-src http://tw.archive.ubuntu.com/ubuntu jaunty-updates main restricted universe multiverse
deb-src http://tw.archive.ubuntu.com/ubuntu jaunty-backports main restricted universe multiverse
deb-src http://tw.archive.ubuntu.com/ubuntu jaunty-proposed main restricted universe multiverse
