ubuntu16.04替换成阿里云源

echo deb http://mirrors.aliyun.com/ubuntu/ xenial main > /etc/apt/sources.list
echo deb-src http://mirrors.aliyun.com/ubuntu/ xenial main >> /etc/apt/sources.list
echo deb http://mirrors.aliyun.com/ubuntu/ xenial-updates main >> /etc/apt/sources.list
echo deb-src http://mirrors.aliyun.com/ubuntu/ xenial-updates main >> /etc/apt/sources.list
echo deb http://mirrors.aliyun.com/ubuntu/ xenial universe >> /etc/apt/sources.list
echo deb-src http://mirrors.aliyun.com/ubuntu/ xenial universe >> /etc/apt/sources.list
echo deb http://mirrors.aliyun.com/ubuntu/ xenial-updates universe >> /etc/apt/sources.list
echo deb-src http://mirrors.aliyun.com/ubuntu/ xenial-updates universe >> /etc/apt/sources.list
echo deb http://mirrors.aliyun.com/ubuntu/ xenial-security main >> /etc/apt/sources.list
echo deb-src http://mirrors.aliyun.com/ubuntu/ xenial-security main >> /etc/apt/sources.list
echo deb http://mirrors.aliyun.com/ubuntu/ xenial-security universe >> /etc/apt/sources.list
echo deb-src http://mirrors.aliyun.com/ubuntu/ xenial-security universe >> /etc/apt/sources.list
apt-get update