debian5.0

　　sudo vim /etc/apt/sources.list
　　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，一般来说加入一至两组即可，加多了影响更新速度。为防止非官方源中软件包不全的问题，请在sources.list文件中尾部添加一组官方源。
# deb file:/cdrom/ etch main contrib

#deb http://mirrors.cn99.com/debian/ lenny main non-free contrib
#deb-src http://mirrors.cn99.com/debian/ lenny main non-free contrib  
deb http://mirrors.163.com/debian stable contrib main non-free
deb-src http://mirrors.163.com/debian stable contrib main non-free
deb http://mirror.dlut.edu.cn/debian/ lenny main non-free contrib
deb-src http://mirror.dlut.edu.cn/debian/ lenny main non-free contrib         
deb http://debian.ustc.edu.cn/debian/ lenny main non-free contrib
deb-src http://debian.ustc.edu.cn/debian/ lenny main non-free contrib
　　deb http://ftp.tw.debian.org/debian lenny main  
　　deb-src http://ftp.tw.debian.org/debian lenny main
　　以上是目前debian lenny 速度稳定的源
　　deb http://ftp.us.debian.org/debian sid main non-free contrib系统默认

　　编辑保存后执行 apt-get update    apt-get upgrade    apt-get dist-upgrade
　　　　
# deb cdrom:[Debian GNU/Linux 6.0.1a _Squeeze_ - Official amd64 NETINST Binary-1  20110320-15:00]/ squeeze main
　　#deb cdrom:[Debian GNU/Linux 6.0.1a _Squeeze_ - Official amd64 NETINST Binary-1  20110320-15:00]/ squeeze main
　　deb http://ftp.us.debian.org/debian/ squeeze main non-free contrib
deb-src http://ftp.us.debian.org/debian/ squeeze main non-free contrib
　　deb http://security.debian.org/ squeeze/updates main contrib non-free
deb-src http://security.debian.org/ squeeze/updates main contrib non-free
　　# squeeze-updates, previously known as 'volatile'
deb http://ftp.us.debian.org/debian/ squeeze-updates main contrib non-free
deb-src http://ftp.us.debian.org/debian/ squeeze-updates main contrib non-free