一、更新源
cat /etc/apt/sources.list
#deb http://mirrors.aliyun.com/ubuntu-ports/ xenial main
#deb-src http://mirrors.aliyun.com/ubuntu-ports/ xenial main#deb http://mirrors.aliyun.com/ubuntu-ports/ xenial-updates main
#deb-src http://mirrors.aliyun.com/ubuntu-ports/ xenial-updates main#deb http://mirrors.aliyun.com/ubuntu-ports/ xenial universe
#deb-src http://mirrors.aliyun.com/ubuntu-ports/ xenial universe
#deb http://mirrors.aliyun.com/ubuntu-ports/ xenial-updates universe
#deb-src http://mirrors.aliyun.com/ubuntu-ports/ xenial-updates universe#deb http://mirrors.aliyun.com/ubuntu-ports/ xenial-security main
#deb-src http://mirrors.aliyun.com/ubuntu-ports/ xenial-security main
#deb http://mirrors.aliyun.com/ubuntu-ports/ xenial-security universe
#deb-src http://mirrors.aliyun.com/ubuntu-ports/ xenial-security universe
deb https://mirrors.aliyun.com/ubuntu-ports f