Ubuntu修改apt-get源方法

      我们在apt-get下载软件或是更新时常常会发现速度很慢，这里很可能和源有关，这个我们可以换为国内的源，以网易163源为例。首先备份下原有的源：

1. sudo cp /etc/apt/source.list /etc/apt/source.list.bak

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然后进行修改：

1. sudo vim /etc/apt/source.list

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把source.list的文件内容替换如下：

1. deb http://mirrors.163.com/ubuntu/ precise main universe restricted multiverse
   
2. deb-src http://mirrors.163.com/ubuntu/ precise main universe restricted multiverse
   
3. deb http://mirrors.163.com/ubuntu/ precise-security universe main multiverse restricted
   
4. deb-src http://mirrors.163.com/ubuntu/ precise-security universe main multiverse restricted
   
5. deb http://mirrors.163.com/ubuntu/ precise-updates universe main multiverse restricted
   
6. deb http://mirrors.163.com/ubuntu/ precise-proposed universe main multiverse restricted
   
7. deb-src http://mirrors.163.com/ubuntu/ precise-proposed universe main multiverse restricted
   
8. deb http://mirrors.163.com/ubuntu/ precise-backports universe main multiverse restricted
   
9. deb-src http://mirrors.163.com/ubuntu/ precise-backports universe main multiverse restricted
   
10. deb-src http://mirrors.163.com/ubuntu/ precise-updates universe main multiverse restricted

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接着进行更新：

1. sudo apt-get update
   
2. sudo apt-get upgrade

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最后你可以尝试下安装软件或是更新，你会发现比以前会快很多，方法简单却十分好使！