Ubuntu 16.04 更换apt源为国内源

本文来自我的个人博客 https://www.zhangshenghai.com/posts/9484/

直接使用国外源的话太慢了，试了几个国内的镜像源，感觉还是阿里源最快。现在北京时间2019年3月12日有效。

首先备份 sources.list：

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

删除 /etc/apt/sources.list 下的内容，修改为：

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

然后更新源试试：

sudo apt-get update
sudo apt-get upgrade