第一条命令
sudo gedit /etc/apt/sources.list
编辑你的源列表，添加下面列表中你觉得适合你的，复制到你的列表中，然后保存列表。
Archive.ubuntu.com更新服务器（欧洲，此为官方源，电信网通用户使用)：
deb jaunty main restricted universe multiverse
deb jaunty-security main restricted universe multiverse
deb jaunty-updates main restricted universe multiverse
deb jaunty-proposed main restricted universe multiverse
deb jaunty-backports main restricted universe multiverse
deb-src jaunty main restricted universe multiverse
deb-src jaunty-security main restricted universe multiverse
deb-src jaunty-updates main restricted universe multiverse
deb-src jaunty-proposed main restricted universe multiverse
deb-src jaunty-backports main restricted universe multiverse
网易163更新服务器：
deb jaunty main restricted universe multiverse
deb jaunty-security main restricted universe multiverse
deb jaunty-updates main restricted universe multiverse
deb jaunty-proposed main restricted universe multiverse
deb jaunty-backports main restricted universe multiverse
deb-src jaunty main restricted universe multiverse
deb-src jaunty-security main restricted universe multiverse
deb-src jaunty-updates main restricted universe multiverse
deb-src jaunty-proposed main restricted universe multiverse
deb-src jaunty-backports main restricted universe multiverse
Mirrors.shlug.org更新服务器（电信服务器，Ubuntu China Official Mirror, maintained by
Shanghai Linux User Group）：
deb jaunty main restricted universe multiverse
deb jaunty-security main restricted universe multiverse
deb jaunty-updates main restricted universe multiverse
deb jaunty-backports main restricted universe multiverse
deb jaunty-proposed main restricted universe multiverse
deb-src jaunty main restricted universe multiverse
deb-src jaunty-security main restricted universe multiverse
deb-src jaunty-updates main restricted universe multiverse
deb-src jaunty-backports main restricted universe multiverse
deb-src jaunty-proposed main restricted universe multiverse
Mirror.lupaworld.com更新服务器（浙江省杭州市双线服务器，推荐）：
deb jaunty main restricted universe multiverse
deb jaunty-security main restricted universe multiverse
deb jaunty-updates main restricted universe multiverse
deb jaunty-backports main restricted universe multiverse
deb jaunty-proposed main restricted universe multiverse
deb-src jaunty main restricted universe multiverse
deb-src jaunty-security main restricted universe multiverse
deb-src jaunty-updates main restricted universe multiverse
deb-src jaunty-backports main restricted universe multiverse
deb-src jaunty-proposed main restricted universe multiverse
厦门大学更新服务器（教育网服务器）：
deb jaunty main restricted universe multiverse
deb jaunty-backports restricted universe multiverse
deb jaunty-proposed main restricted universe multiverse
deb jaunty-security main restricted universe multiverse
deb jaunty-updates main restricted universe multiverse
deb-src jaunty main restricted universe multiverse
deb-src jaunty-backports main restricted universe multiverse
deb-src jaunty-proposed main restricted universe multiverse
deb-src jaunty-security main restricted universe multiverse
deb-src jaunty-updates main restricted universe multiverse
成都市 电子科技大学更新服务器（教育网，推荐校园网和网通用户使用）：
deb jaunty main multiverse restricted universe
deb jaunty-backports main multiverse restricted universe
deb jaunty-proposed main multiverse restricted universe
deb jaunty-security main multiverse restricted universe
deb jaunty-updates main multiverse restricted universe
deb-src jaunty main multiverse restricted universe
deb-src jaunty-backports main multiverse restricted universe
deb-src jaunty-proposed main multiverse restricted universe
deb-src jaunty-security main multiverse restricted universe
deb-src jaunty-updates main multiverse restricted universe
== 如果无法解析uestc.edu.cn域名，请使用以下地址 ==
deb jaunty main multiverse restricted universe
deb jaunty-backports main multiverse restricted universe
deb jaunty-proposed main multiverse restricted universe
deb jaunty-security main multiverse restricted universe
deb jaunty-updates main multiverse restricted universe
deb-src jaunty main multiverse restricted universe
deb-src jaunty-backports main multiverse restricted universe
deb-src jaunty-proposed main multiverse restricted universe
deb-src jaunty-security main multiverse restricted universe
deb-src jaunty-updates main multiverse restricted universe
上海市上海交通大学更新服务器（教育网，推荐校园网和网通用户使用）：
deb jaunty main multiverse restricted universe
deb jaunty-backports main multiverse restricted universe
deb jaunty-proposed main multiverse restricted universe
deb jaunty-security main multiverse restricted universe
deb jaunty-updates main multiverse restricted universe
deb-src jaunty main multiverse restricted universe
deb-src jaunty-backports main multiverse restricted universe
deb-src jaunty-proposed main multiverse restricted universe
deb-src jaunty-security main multiverse restricted universe
deb-src jaunty-updates main multiverse restricted universe
中国科学技术大学更新服务器（教育网，推荐校园网和网通用户使用）：
deb jaunty main multiverse restricted universe
deb jaunty-backports main multiverse restricted universe
deb jaunty-proposed main multiverse restricted universe
deb jaunty-security main multiverse restricted universe
deb jaunty-updates main multiverse restricted universe
deb-src jaunty main multiverse restricted universe
deb-src jaunty-backports main multiverse restricted universe
deb-src jaunty-proposed main multiverse restricted universe
deb-src jaunty-security main multiverse restricted universe
deb-src jaunty-updates main multiverse restricted universe
中国台湾 台湾大学更新服务器（推荐网通用户使用，电信PING平均响应速度41MS。强烈推荐此源，比较完整，较少出现同步问题）：
deb jaunty main restricted universe multiverse
deb-src jaunty main restricted universe multiverse
deb jaunty-updates main restricted universe multiverse
deb-src jaunty-updates main restricted universe multiverse
deb jaunty-backports main restricted universe multiverse
deb-src jaunty-backports main restricted universe multiverse
deb jaunty-security main restricted universe multiverse
deb-src jaunty-security main restricted universe multiverse
deb jaunty-proposed main multiverse restricted universe
deb-src jaunty-proposed main restricted universe multiverse
mirror.rootguide.org更新服务器（上海市 电信）：
deb jaunty main restricted universe multiverse
deb-src jaunty main restricted universe multiverse
deb jaunty-updates main restricted universe multiverse
deb-src jaunty-updates main restricted universe multiverse
deb jaunty-backports main restricted universe multiverse
deb-src jaunty-backports main restricted universe multiverse
deb jaunty-security main restricted universe multiverse
deb-src jaunty-security main restricted universe multiverse
deb jaunty-proposed main multiverse restricted universe
deb-src jaunty-proposed main restricted universe multiverse
台湾的官方源速度也相当不错，有时甚至快于内地的：
deb jaunty main restricted universe multiverse
deb jaunty-security main restricted universe multiverse
deb jaunty-updates main restricted universe multiverse
deb jaunty-backports main restricted universe multiverse
deb jaunty-proposed main restricted universe multiverse
deb-src jaunty main restricted universe multiverse
deb-src jaunty-security main restricted universe multiverse
deb-src jaunty-updates main restricted universe multiverse
deb-src jaunty-backports main restricted universe multiverse
deb-src jaunty-proposed main restricted universe multiverse
第二条命令
sudo apt-get update
更新源列表信息
第三条命令
sudo update-manager -d
运行更新管理器，你会看到下图，点击升级
发行版升级
此后就是漫长的等待，选择好的源很重要，会节省很多下载的时间，下载完后配置新的系统，重启系统，就是9.04了。
如果你迫不及待想体验的话，那就按照本文开始吧！Just do it!
享受开源，享受ubuntu！
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