cd /etc/apt/

进入apt目录

echo deb http://mirrors.163/ubuntu/ trusty main restricted universe multiverse >> sources.list

echo deb http://mirrors.163/ubuntu/ trusty-security main restricted universe multiverse >> sources.list

echo deb http://mirrors.163/ubuntu/ trusty-updates main restricted universe multiverse >> sources.list

echo deb http://mirrors.163/ubuntu/ trusty-proposed main restricted universe multiverse >> sources.list

echo deb http://mirrors.163/ubuntu/ trusty-backports main restricted universe multiverse >> sources.list

echo deb-src http://mirrors.163/ubuntu/ trusty main restricted universe multiverse >> sources.list

echo deb-src http://mirrors.163/ubuntu/ trusty-security main restricted universe multiverse >> sources.list

echo deb-src http://mirrors.163/ubuntu/ trusty-updates main restricted universe multiverse >> sources.list

echo deb-src http://mirrors.163/ubuntu/ trusty-proposed main restricted universe multiverse >> sources.list

echo deb-src http://mirrors.163/ubuntu/ trusty-backports main restricted universe multiverse >> sources.list

追加内容进文件

apt-get update

apt-get install vim

更新源，并安装vim

apt-get update

通过vim把sources.list文件的前两行删除掉 再重新update