linux系统装好后怎么更新源？
Linux软件源的设置方法
1 打开数据源配置文件
vi /etc/apt/sources.list
添加相关的数据源,可以选择以下的数据源,不要写太多，否则会影响更新速度。
之后使用apt-get update更新源列表
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。
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# 163
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deb http://mirrors.163.com/debian/ lenny main contrib non-free
deb-src http://mirrors.163.com/debian lenny main contrib non-free
deb http://mirrors.163.com/debian-security/ stable/updates main
deb-src http://mirrors.163.com/debian-security/ stable/updates main
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# official
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deb http://ftp.debian.org/debian/ lenny main contrib non-free
deb-src http://ftp.debian.org/debian/ lenny main contrib non-free
deb http://ftp.us.debian.org/debian/ lenny main contrib non-free
deb-src http://ftp.us.debian.org/debian/ lenny main contrib non-free
deb http://security.debian.org/ stable/updates main
deb-src http://security.debian.org/ stable/updates main
deb http://volatile.debian.org/debian-volatile stable/volatile main
deb-src http://volatile.debian.org/debian-volatile stable/volatile main
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# 台湾及大陆教育网高校等
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deb http://ftp.tw.debian.org/debian/ lenny main contrib non-free
deb-src http://ftp.tw.debian.org/debian lenny main contrib non-free
deb http://mirrors.geekbone.org/debian/ lenny main contrib non-free
deb-src http://mirrors.geekbone.org/debian/ lenny main contrib non-free
deb http://mirror.dlut.edu.cn/debian/ lenny main contrib non-free
deb-src http://mirror.dlut.edu.cn/debian/ lenny main contrib non-free
deb http://debian.csie.ntu.edu.tw/debian/ lenny main contrib non-free
deb-src http://debian.csie.ntu.edu.tw/debian/ lenny main contrib non-free
### ustc debian-multimedia
deb http://debian.ustc.edu.cn/debian-multimedia/ stable main
deb-src http://debian.ustc.edu.cn/debian-multimedia/ stable main
### ustc debian-security
deb http://debian.ustc.edu.cn/debian-security/ stable/updates main non-free contrib
deb-src http://debian.ustc.edu.cn/debian-security/ stable/updates main non-free contrib
台湾及大陆教育网高校等
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deb http://ftp.tw.debian.org/debian/ lenny main contrib non-free
deb-src http://ftp.tw.debian.org/debian lenny main contrib non-free
deb http://mirrors.geekbone.org/debian/ lenny main contrib non-free
deb-src http://mirrors.geekbone.org/debian/ lenny main contrib non-free
deb http://mirror.dlut.edu.cn/debian/ lenny main contrib non-free
deb-src http://mirror.dlut.edu.cn/debian/ lenny main contrib non-free
deb http://debian.csie.ntu.edu.tw/debian/ lenny main contrib non-free
deb-src http://debian.csie.ntu.edu.tw/debian/ lenny main contrib non-free
### ustc debian-multimedia
deb http://debian.ustc.edu.cn/debian-multimedia/ stable main
deb-src http://debian.ustc.edu.cn/debian-multimedia/ stable main
### ustc debian-security
deb http://debian.ustc.edu.cn/debian-security/ stable/updates main non-free contrib
deb-src http://debian.ustc.edu.cn/debian-security/ stable/updates main non-free contrib
如何设置Linux最快的更新源？
我一般是通过命令获取的：
#sudo apt-get update
而/etc/apt/sources.list这个文件中是一个指示apt程序到哪里去获取资源的资源列表文件。apt-get update之后的内容不会反应在这里。另外，apt-get update只是更新了apt的资源列表，没有真正的对系统执行更新。如果需要，要使用apt-get upgrade来更新。
这个英文短文就是一些关于这个命令的说明，可以查看一下
Syncking with Repository After saving your sources.list file, we first want to update our local database so that it’s in sync with Debian’s sources:
apt-get updateThe output will show apt-get downloading the information from Debian’s servers and then syncking its own database. Your output should look something like this:
linuxhelp.net:~# apt-get updateGet:1 ftp://ftp.debian.org testing/main Packages Get:2 http://security.debian.org stable/updates/main Packages Get:3 http://security.debian.org stable/updates/main Release Get:4 ftp://ftp.debian.org testing/main Release Get:5ftp://ftp.debian.org testing/main Sources Get:6 ftp://ftp.debian.org testing/main Release Fetched 4744kB in 2m40s (29.5kB/s)Reading Package Lists… Donelinuxhelp.net:~#