apt-get 下载慢，软件源修改为国内 163（apt-get upadte 和 apt-get install vim）

1, 备份sources.list

mv /etc/apt/sources.list /etc/apt/sources.bak.list

2，增加163软件源

echo "deb http://mirrors.163.com/debian/ jessie main non-free contrib" >> /etc/apt/sources.list
echo "deb http://mirrors.163.com/debian/ jessie-proposed-updates main non-free contrib" >>/etc/apt/sources.list
echo "deb-src http://mirrors.163.com/debian/ jessie main non-free contrib" >>/etc/apt/sources.list
echo "deb-src http://mirrors.163.com/debian/ jessie-proposed-updates main non-free contrib" >>/etc/apt/sources.list