1、原文件备份
sudo cp /etc/apt/sources.list /etc/apt/sources.list.bak
2、编辑源列表文件
sudo vim /etc/apt/sources.list
3、将原来的列表删除，添加如下内容（中科大镜像源）
deb http://mirrors.ustc.edu.cn/ubuntu/ xenial main restricted universe multiverse deb http://mirrors.ustc.edu.cn/ubuntu/ xenial-security main restricted universe multiverse deb http://mirrors.ustc.edu.cn/ubuntu/ xenial-updates main restricted universe multiverse deb http://mirrors.ustc.edu.cn/ubuntu/ xenial-proposed main restricted universe multiverse deb http://mirrors.ustc.edu.cn/ubuntu/ xenial-backports main restricted universe multiverse deb-src http://mirrors.ustc.edu.cn/ubuntu/ xenial main restricted universe multiverse deb-src http://mirrors.ustc.edu.cn/ubuntu/ xenial-security main restricted universe multiverse deb-src http://mirrors.ustc.edu.cn/ubuntu/ xenial-updates main restricted universe multiverse deb-src http://mirrors.ustc.edu.cn/ubuntu/ xenial-proposed main restricted universe multiverse deb-src http://mirrors.ustc.edu.cn/ubuntu/ xenial-backports main restricted universe multiverse
京东云镜像配置
deb http://mirrors.jdcloudcs.com/ubuntu/ xenial main restricted deb http://mirrors.jdcloudcs.com/ubuntu/ xenial-updates main restricted deb http://mirrors.jdcloudcs.com/ubuntu/ xenial universe deb http://mirrors.jdcloudcs.com/ubuntu/ xenial-updates universe deb http://mirrors.jdcloudcs.com/ubuntu/ xenial multiverse deb http://mirrors.jdcloudcs.com/ubuntu/ xenial-updates multiverse deb http://mirrors.jdcloudcs.com/ubuntu/ xenial-backports main restricted universe multiverse deb http://mirrors.jdcloudcs.com/ubuntu/ xenial-security main restricted deb http://mirrors.jdcloudcs.com/ubuntu/ xenial-security universe deb http://mirrors.jdcloudcs.com/ubuntu/ xenial-security multiverse
4、运行
sudo apt-get update