Ubuntu 14.04 更换源为阿里云源

Ubuntu更新速度巨慢的话有可能是源的问题，国内的机器可以更换为阿里云源或163源。

操作之前先备份

cp /etc/apt/sources.list /etc/apt/sources.list.bak

编辑sources.list文件

vim /etc/apt/sources.list

清空里面内容后贴入以下地址

deb http://mirrors.aliyun.com/ubuntu/ trusty main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ trusty-security main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ trusty-updates main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ trusty-proposed main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ trusty-backports main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ trusty main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ trusty-security main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ trusty-updates main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ trusty-proposed main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ trusty-backports main restricted universe multiverse

再apt-get update更新一下

参考文章https://my.oschina.net/liuyuantao/blog/798960