依次执行以下命令

先备份一下source.list文件

cp /etc/apt/sources.list /etc/apt/sources.list.bak

然后往文件里写入内容。由于现在没有vi/vim，而且由于ubuntu官方源不在国内，所以只能把内容通过echo方式重定向到文件中。

echo "deb http://mirrors.ustc.edu.cn/ubuntu/ xenial main restricted universe multiverse" >/etc/apt/sources.list
echo "deb http://mirrors.ustc.edu.cn/ubuntu/ xenial-security main restricted universe multiverse" >>/etc/apt/sources.list
echo "deb http://mirrors.ustc.edu.cn/ubuntu/ xenial-updates main restricted universe multiverse" >>/etc/apt/sources.list
echo "deb http://mirrors.ustc.edu.cn/ubuntu/ xenial-proposed main restricted universe multiverse" >>/etc/apt/sources.list
echo "deb http://mirrors.ustc.edu.cn/ubuntu/ xenial-backports main restricted universe multiverse" >>/etc/apt/sources.list
echo "deb-src http://mirrors.ustc.edu.cn/ubuntu/ xenial main restricted universe multiverse" >>/etc/apt/sources.list
echo "deb-src http://mirrors.ustc.edu.cn/ubuntu/ xenial-security main restricted universe multiverse" >>/etc/apt/sources.list
echo "deb-src http://mirrors.ustc.edu.cn/ubuntu/ xenial-updates main restricted universe multiverse" >>/etc/apt/sources.list
echo "deb-src http://mirrors.ustc.edu.cn/ubuntu/ xenial-proposed main restricted universe multiverse" >> /etc/apt/sources.list
echo "deb-src http://mirrors.ustc.edu.cn/ubuntu/ xenial-backports main restricted universe multiverse" >>/etc/apt/sources.list

更新apt源

apt-get update 

安装vim

apt-get install -y vim