先备份默认的souces.list

cd /etc/apt
cp sources.list sources.list.back

编辑sources.list文件 将内容根据Ubutun版本替换成下列内容

Ubuntu16.04

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

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