舍弃教育网，但是又不清楚现在的网络类型，于是在更新源时把我觉得可能正确的源链接全部加入，如下步骤： 1 先复制原来的 sudo cp /etc/apt/sources.list /etc/apt/sources.list_backup 2 编辑sources.list(如果在/etc/apt直接打开sources.list进行编辑是要在root的权限下，但是据说老使用root仅限安全性能不太好。用这种命令行的方法，则不用再转换成root) sudo gedit /etc/apt/sources.list 3 在打开的sources.list下，输入源链接。保存 4 输入如下命令，进行更新 sudo apt-get update sudo apt-get dist-upgrade 源链接是在网上找的，应该是ubuntu的一个中文论坛上的，之前以网页形式保存在我的机子上，出处忘记了，就不写出处了吧，抱歉： # 从以下各服务器列表内容中选择一段替换文件中的所有内容（请根据自己网络环境设置更新服务器，以达到最快的速度。） * Archive.ubuntu.com 更新服务器(欧洲)： # deb http://archive.ubuntu.com/ubuntu/ dapper main restricted universe multiverse deb http://archive.ubuntu.com/ubuntu/ dapper-security main restricted universe multiverse deb http://archive.ubuntu.com/ubuntu/ dapper-updates main restricted universe multiverse deb http://archive.ubuntu.com/ubuntu/ dapper-backports main restricted universe multiverse deb http://archive.ubuntu.org.cn/ubuntu-cn/ dapper main restricted universe multiverse * Ubuntu.cn99.com 更新服务器(江苏省常州市电信，推荐电信用户使用。）： # deb http://ubuntu.cn99.com/ubuntu/ dapper main restricted universe multiverse deb http://ubuntu.cn99.com/ubuntu/ dapper-updates main restricted universe multiverse deb http://ubuntu.cn99.com/ubuntu/ dapper-security main restricted universe multiverse deb http://ubuntu.cn99.com/ubuntu/ dapper-backports main restricted universe multiverse deb http://ubuntu.cn99.com/ubuntu-cn/ dapper main restricted universe multiverse * Mirror.lupaworld.com 更新服务器(浙江省杭州市电信，亚洲地区官方更新服务器，推荐全国用户使用。）： # deb http://cn.archive.ubuntu.com/ubuntu dapper main restricted universe multiverse deb http://cn.archive.ubuntu.com/ubuntu dapper-security main restricted universe multiverse deb http://cn.archive.ubuntu.com/ubuntu dapper-updates main restricted universe multiverse deb http://cn.archive.ubuntu.com/ubuntu dapper-backports main restricted universe multiverse deb http://mirror.lupaworld.com/ubuntu/ubuntu-cn dapper main restricted universe multiverse deb http://security.ubuntu.com/ubuntu dapper-security main restricted universe multiverse deb-src http://cn.archive.ubuntu.com/ubuntu dapper main restricted universe multiverse deb-src http://cn.archive.ubuntu.com/ubuntu dapper-security main restricted universe multiverse deb-src http://cn.archive.ubuntu.com/ubuntu dapper-updates main restricted universe multiverse deb-src http://cn.archive.ubuntu.com/ubuntu dapper-backports main restricted universe multiverse deb-src http://security.ubuntu.com/ubuntu dapper-security main restricted universe multiverse * 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。）(目前已无法使用)： # deb http://ftp.sjtu.edu.cn/ubuntu/ dapper main multiverse restricted universe deb http://ftp.sjtu.edu.cn/ubuntu/ dapper-backports main multiverse restricted universe deb http://ftp.sjtu.edu.cn/ubuntu/ dapper-proposed main multiverse restricted universe deb http://ftp.sjtu.edu.cn/ubuntu/ dapper-security main multiverse restricted universe deb http://ftp.sjtu.edu.cn/ubuntu/ dapper-updates main multiverse restricted universe deb http://ftp.sjtu.edu.cn/ubuntu-cn/ dapper main multiverse restricted universe * 北京市清华大学 更新服务器（教育网，推荐校园网和网通用户使用。)： # deb http://mirror9.net9.org/ubuntu/ dapper main multiverse restricted universe deb http://mirror9.net9.org/ubuntu/ dapper-backports main multiverse restricted universe deb http://mirror9.net9.org/ubuntu/ dapper-proposed main multiverse restricted universe deb http://mirror9.net9.org/ubuntu/ dapper-security main multiverse restricted universe deb http://mirror9.net9.org/ubuntu/ dapper-updates main multiverse restricted universe deb http://mirror9.net9.org/ubuntu-cn/ dapper main multiverse restricted universe * 中国 台湾省台湾大学 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/ dapper main restricted universe multiverse deb-src http://ubuntu.csie.ntu.edu.tw/ubuntu/ dapper main restricted universe multiverse deb http://ubuntu.csie.ntu.edu.tw/ubuntu/ dapper-updates main restricted universe multiverse deb-src http://ubuntu.csie.ntu.edu.tw/ubuntu/ dapper-updates main restricted universe multiverse deb http://ubuntu.csie.ntu.edu.tw/ubuntu/ dapper-backports main restricted universe multiverse deb-src http://ubuntu.csie.ntu.edu.tw/ubuntu/ dapper-backports main restricted universe multiverse deb http://ubuntu.csie.ntu.edu.tw/ubuntu/ dapper-security main restricted universe multiverse deb-src http://ubuntu.csie.ntu.edu.tw/ubuntu/ dapper-security main restricted universe multiverse deb http://ftp.sjtu.edu.cn/ubuntu-cn/ dapper main multiverse restricted universe * Mirror.vmmatrix.net 更新服务器（上海市电信，推荐电信网通用户使用。）(目前已无法使用): # deb http://mirror.vmmatrix.net/ubuntu/ dapper main restricted universe multiverse deb-src http://mirror.vmmatrix.net/ubuntu/ dapper main restricted universe multiverse deb http://mirror.vmmatrix.net/ubuntu/ dapper-updates main restricted universe multiverse deb-src http://mirror.vmmatrix.net/ubuntu/ dapper-updates main restricted universe multiverse deb http://mirror.vmmatrix.net/ubuntu/ dapper-backports main restricted universe multiverse deb-src http://mirror.vmmatrix.net/ubuntu/ dapper-backports main restricted universe multiverse deb http://mirror.vmmatrix.net/ubuntu/ dapper-security main restricted universe multiverse deb-src http://mirror.vmmatrix.net/ubuntu/ dapper-security main restricted universe multiverse deb http://ftp.sjtu.edu.cn/ubuntu-cn/ dapper main multiverse restricted universe * ubuntu.cnsite.org 更新服务器 (福建省福州市 电信): # deb http://ubuntu.cnsite.org/ubuntu/ dapper main restricted universe multiverse deb-src http://ubuntu.cnsite.org/ubuntu/ dapper main restricted universe multiverse deb http://ubuntu.cnsite.org/ubuntu/ dapper-updates main restricted universe multiverse deb-src http://ubuntu.cnsite.org/ubuntu/ dapper-updates main restricted universe multiverse deb http://ubuntu.cnsite.org/ubuntu/ dapper-backports main restricted universe multiverse deb-src http://ubuntu.cnsite.org/ubuntu/ dapper-backports main restricted universe multiverse deb http://ubuntu.cnsite.org/ubuntu/ dapper-security main restricted universe multiverse deb-src http://ubuntu.cnsite.org/ubuntu/ dapper-security main restricted universe multiverse deb http://ubuntu.cnsite.org/ubuntu-cn/ dapper main multiverse restricted universe * mirror.rootguide.org 更新服务器 (上海市 电信): # deb http://mirror.rootguide.org/ubuntu/ dapper main restricted universe multiverse deb-src http://mirror.rootguide.org/ubuntu/ dapper main restricted universe multiverse deb http://mirror.rootguide.org/ubuntu/ dapper-updates main restricted universe multiverse deb-src http://mirror.rootguide.org/ubuntu/ dapper-updates main restricted universe multiverse deb http://mirror.rootguide.org/ubuntu/ dapper-backports main restricted universe multiverse deb-src http://mirror.rootguide.org/ubuntu/ dapper-backports main restricted universe multiverse deb http://mirror.rootguide.org/ubuntu/ dapper-security main restricted universe multiverse deb-src http://mirror.rootguide.org/ubuntu/ dapper-security main restricted universe multiverse deb http://mirror.rootguide.org/ubuntu/ dapper-proposed main multiverse restricted universe deb-src http://mirror.rootguide.org/ubuntu/ dapper-proposed main restricted universe multiverse deb http://mirror.rootguide.org/ubuntu-cn/ dapper main multiverse restricted universe * 到以下网址可以自定义产生若干源：http://www.ubuntulinux.nl/source-o-matic 以下网址有极其全面的源，以供补充：http://italy.copybase.ch/blog/lista-repository-sourceslist-ottimizzata-per-ubuntu-kubuntu-linux/

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