1.软件源下载慢问题
备份软件源：sudo cp /etc/apt/sources.list /etc/apt/sources.list
打开sources.list：sudo gedit /etc/apt/sources.list
把原有deb开头的内容全部去掉，联网状态下，把下面的源一组一组地拷进去（保证每次只拷贝一组），具体也用不着那么壮烈，可以借鉴旁边的推荐意见试试其中几个。每送进一组，Ctrl+S保存，启动更新管理器，点击“检查更新”，这时Ubuntu就会从你设定的源下载软件列表，你这时观察一下下载速度，如果很快的话，就选他了！（参考：我使用徐州校园网电信，教育网连接时厦门大学的非常快）。
此外，也并不能完全照着拷贝这些，Ubuntu每个稳定版本都有一个代号，譬如8.04叫hardy，9.10叫karmic，10.04叫lucid，有些软件源为了区分版本有这个代号。相信你的安装光盘应该有这个代号，具体软件源最好是到网上查一下某版本的软件源，查不到的话，直接把下面软件源里的hardy替换成你的版本的代号即可
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 intrepid main restricted universe multiverse
deb intrepid-security main restricted universe multiverse
deb intrepid-updates main restricted universe multiverse
deb intrepid-proposed main restricted universe multiverse
deb intrepid-backports main restricted universe multiverse
deb-src intrepid main restricted universe multiverse
deb-src intrepid-security main restricted universe multiverse
deb-src intrepid-updates main restricted universe multiverse
deb-src intrepid-proposed main restricted universe multiverse
deb-src intrepid-backports main restricted universe multiverse
台湾大学更新服务器（推荐网通用户使用，强烈推荐此源，比较完整）：
deb intrepid main restricted universe multiverse
deb-src intrepid main restricted universe multiverse
deb intrepid-updates main restricted universe multiverse
deb-src intrepid-updates main restricted universe multiverse
deb intrepid-backports main restricted universe multiverse
deb-src intrepid-backports main restricted universe multiverse
deb intrepid-security main restricted universe multiverse
deb-src intrepid-security main restricted universe multiverse
deb intrepid-proposed main multiverse restricted universe
deb-src intrepid-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/ intrepid main restricted universe multiverse
deb ftp://ubuntu.realss.cn/ubuntu/ intrepid-backports restricted universe multiverse
deb ftp://ubuntu.realss.cn/ubuntu/ intrepid-proposed main restricted universe multiverse
deb ftp://ubuntu.realss.cn/ubuntu/ intrepid-security main restricted universe multiverse
deb ftp://ubuntu.realss.cn/ubuntu/ intrepid-updates main restricted universe multiverse
deb-src ftp://ubuntu.realss.cn/ubuntu/ intrepid main restricted universe multiverse
deb-src ftp://ubuntu.realss.cn/ubuntu/ intrepid-backports main restricted universe multiverse
deb-src ftp://ubuntu.realss.cn/ubuntu/ intrepid-proposed main restricted universe multiverse
deb-src ftp://ubuntu.realss.cn/ubuntu/ intrepid-security main restricted universe multiverse
deb-src ftp://ubuntu.realss.cn/ubuntu/ intrepid-updates main restricted universe multiverse
对于电信网络用户，推荐CN99的源，速度非常快。
deb hardy main restricted universe multiverse
deb hardy-security main restricted universe multiverse
deb hardy-updates main restricted universe multiverse
deb hardy-proposed main restricted universe multiverse
deb hardy-backports main restricted universe multiverse
deb-src hardy main restricted universe multiverse
deb-src hardy-security main restricted universe multiverse
deb-src hardy-updates main restricted universe multiverse
deb-src hardy-proposed main restricted universe multiverse
deb-src hardy-backports main restricted universe multiverse
推荐网通用户使用台湾大学的源：
deb hardy main restricted universe multiverse
deb-src hardy main restricted universe multiverse
deb hardy-updates main restricted universe multiverse
deb-src hardy-updates main restricted universe multiverse
deb hardy-backports main restricted universe multiverse
deb-src hardy-backports main restricted universe multiverse
deb hardy-security main restricted universe multiverse
deb-src hardy-security main restricted universe multiverse
deb hardy-proposed main multiverse restricted universe
deb-src hardy-proposed main restricted universe multiverse
校园网的朋友，推荐厦门大学Ubuntu服务器：
deb ftp://ubuntu.realss.cn/ubuntu/ hardy main restricted universe multiverse
deb ftp://ubuntu.realss.cn/ubuntu/ hardy-backports restricted universe multiverse
deb ftp://ubuntu.realss.cn/ubuntu/ hardy-proposed main restricted universe multiverse
deb ftp://ubuntu.realss.cn/ubuntu/ hardy-security main restricted universe multiverse
deb ftp://ubuntu.realss.cn/ubuntu/ hardy-updates main restricted universe multiverse
deb-src ftp://ubuntu.realss.cn/ubuntu/ hardy main restricted universe multiverse
deb-src ftp://ubuntu.realss.cn/ubuntu/ hardy-backports main restricted universe multiverse
deb-src ftp://ubuntu.realss.cn/ubuntu/ hardy-proposed main restricted universe multiverse
deb-src ftp://ubuntu.realss.cn/ubuntu/ hardy-security main restricted universe multiverse
deb-src ftp://ubuntu.realss.cn/ubuntu/ hardy-updates main restricted universe multiverse