转载*请注明原始出处：http://blog.csdn.net/a464057216/article/details/50865895
先备份源/etc/apt/sources.list为sources.list.bak，然后修改sourcese.list：
$ sudo vi sources.list
将原来的配置文件的内容更改如下：
deb http://mirrors.163.com/ubuntu/ trusty main restricted universe multiverse
deb http://mirrors.163.com/ubuntu/ trusty-security main restricted universe multiverse
deb http://mirrors.163.com/ubuntu/ trusty-updates main restricted universe multiverse
deb http://mirrors.163.com/ubuntu/ trusty-proposed main restricted universe multiverse
deb http://mirrors.163.com/ubuntu/ trusty-backports main restricted universe multiverse
deb-src http://mirrors.163.com/ubuntu/ trusty main restricted universe multiverse
deb-src http://mirrors.163.com/ubuntu/ trusty-security main restricted universe multiverse
deb-src http://mirrors.163.com/ubuntu/ trusty-updates main restricted universe multiverse
deb-src http://mirrors.163.com/ubuntu/ trusty-proposed main restricted universe multiverse
deb-src http://mirrors.163.com/ubuntu/ trusty-backports main restricted universe multiverse- 1
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然后执行$ sudo apt-get update更新源列表。
PS：如果是阿里云上的机器，推荐使用Ubuntu的官方源，因为官方源也是放在阿里云上的。
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