软件源介绍：
软件源就是一个应用程序安装库，很多很多的应用软件都在这个库里面。他可以是网络服务器
，是光盘，甚至是硬盘上的一个目录。作为debian系的ubuntu，继承了debian的deb和apt系统，只
要设定好软件源，就能很方便的安装软件了。
1,如何修改软件源：sudo gedit /etc/apt/sources.list 然后将文件里面的全部删掉，
复制一个下面你认为最快 的源，然后保存。
2,如何更新源信息： sudo apt-get update 即可。
3,如何更新系统： sudo apt-get upgrade 即可
电子科技大学ubuntu各个版本的源 :
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Ubuntu 12.04 Precise Pangolin
deb
deb
deb
deb http://ubuntu.uestc.edu.cn/ubuntu/ precise-security main restricted universe multiverse
deb
deb-src
deb-src
deb-src
deb-src http://ubuntu.uestc.edu.cn/ubuntu/ precise-security main restricted universe multiverse
deb-src |
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Ubuntu 11.10 Oneiric Ocelot
deb
deb
deb
deb http://ubuntu.uestc.edu.cn/ubuntu/ oneiric-security main restricted universe multiverse
deb
deb-src
deb-src
deb-src
deb-src http://ubuntu.uestc.edu.cn/ubuntu/ oneiric-security main restricted universe multiverse
deb-src |
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Ubuntu 11.04 Natty Narwhal
deb
deb
deb
deb http://ubuntu.uestc.edu.cn/ubuntu/ natty-security main restricted universe multiverse
deb
deb-src
deb-src
deb-src
deb-src http://ubuntu.uestc.edu.cn/ubuntu/ natty-security main restricted universe multiverse
deb-src |
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Ubuntu 10.10 Maverick Meerkat
deb
deb
deb
deb http://ubuntu.uestc.edu.cn/ubuntu/ maverick-security main restricted universe multiverse
deb
deb-src
deb-src
deb-src
deb-src http://ubuntu.uestc.edu.cn/ubuntu/ maverick-security main restricted universe multiverse
deb-src |
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Ubuntu 10.04 Lucid Lynx
deb
deb
deb
deb http://ubuntu.uestc.edu.cn/ubuntu/ lucid-security main restricted universe multiverse
deb
deb-src
deb-src
deb-src
deb-src http://ubuntu.uestc.edu.cn/ubuntu/ lucid-security main restricted universe multiverse
deb-src |
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