ubuntu 的软件包管理真的很方便，当然要设置一个稳定快速且更新及时的源，我经常使用台湾源，这个很稳定，速度比国内的也快些。
sudo gedit /etc/apt/sources.list
根据个人情况，在文后的附表中选择合适的源粘贴进去
sudo apt-get update
sudo apt-get dist-upgrade
（这步得注意！如果执行的是：sudo apt-get upgrade 则只是进行了软件升级，而非版本升级）
附：源列表Ubuntu 9.04
Archive.Ubuntu.com更新服务器（欧洲，此为官方源，电信网通用户使用)：
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
网易163更新服务器：
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更新服务器（电信服务器，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更新服务器（浙江省杭州市双线服务器，推荐）：
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
厦门大学更新服务器（教育网服务器）：
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 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 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
== 如果无法解析uestc.edu.cn域名，请使用以下地址 ==
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
上海市上海交通大学更新服务器（教育网，推荐校园网和网通用户使用）：
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 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 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更新服务器（上海市 电信）：
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
台湾的官方源速度也相当不错，有时甚至快于内地的：
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
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