重装ubuntu后，更新速度一直上不去，然后随便从网上copy了一些源加进来，结果更新速度还是很慢。
觉得不舒服，仔细比较了源后，发现原来源是有版本区别的！！！！自己狂汗一阵。
然后专门搜索了9.04的源，速度大增：原来一周才能更新好的东西，一小时就解决了。

此次所得，特铭文记之。
备份source.list，官方给配置的，不用也罢──删除。
用下面的源建立新的source.list

============================
deb http://mirror.bjtu.edu.cn/ubuntu/ jaunty main restricted universe multiverse
deb http://mirror.bjtu.edu.cn/ubuntu/ jaunty-backports restricted universe multiverse
deb http://mirror.bjtu.edu.cn/ubuntu/ jaunty-proposed main restricted universe multiverse
deb http://mirror.bjtu.edu.cn/ubuntu/ jaunty-security main restricted universe multiverse
deb http://mirror.bjtu.edu.cn/ubuntu/ jaunty-updates main restricted universe multiverse
deb-src http://mirror.bjtu.edu.cn/ubuntu/ jaunty main restricted universe multiverse
deb-src http://mirror.bjtu.edu.cn/ubuntu/ jaunty-backports main restricted universe multiverse
deb-src http://mirror.bjtu.edu.cn/ubuntu/ jaunty-proposed main restricted universe multiverse
deb-src http://mirror.bjtu.edu.cn/ubuntu/ jaunty-security main restricted universe multiverse
deb-src http://mirror.bjtu.edu.cn/ubuntu/ jaunty-updates main restricted universe multiverse

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

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

^分别是北交源，台湾源，163源。对我来说速度从高到低，还是学校好啊。

=========================
软推：
iptux，linux下的飞鸽，和win下的飞鸽互通，但功能更强大。
tee，既输出到屏幕也输出到文件。