原文：https://blog.csdn.net/nbxuwentao/article/details/90524349
方案一：
解决方案
1. vi etc/apt/sources.list
2. 将里面的内容替换成下面这些(artful可以更换，主要看http://mirrors.163.com/ubuntu/dists/下面有哪些可用的前缀自行更换) deb http://mirrors.163.com/ubuntu/ artful main restricted universe multiverse deb http://mirrors.163.com/ubuntu/ artful-security main restricted universe multiverse deb http://mirrors.163.com/ubuntu/ artful-updates main restricted universe multiverse deb http://mirrors.163.com/ubuntu/ artful-proposed main restricted universe multiverse deb http://mirrors.163.com/ubuntu/ artful-backports main restricted universe multiverse deb-src http://mirrors.163.com/ubuntu/ artful main restricted universe multiverse deb-src http://mirrors.163.com/ubuntu/ artful-security main restricted universe multiverse deb-src http://mirrors.163.com/ubuntu/ artful-updates main restricted universe multiverse deb-src http://mirrors.163.com/ubuntu/ artful-proposed main restricted universe multiverse deb-src http://mirrors.163.com/ubuntu/ artful-backports main restricted universe multiverse 之后输入： sudo apt-get update
方案2：
（1）编辑/etc/apt/sources.list文件 在命令行中输入： sudo vim /etc/apt/sources.list 或者 sudo gedit /etc/apt/sources.list 推荐使用后者 （2）在上面打开的文件开头添加（中科大的源） 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 之后输入： sudo apt-get update