国内推荐阿里云的开源镜像服务，地址为http://mirrors.aliyun.com
vi /etc/apt/sources.list
将默认的raspbian.org源注释(#)掉，加入阿里云的raspbian源
deb http://mirrors.aliyun.com/raspbian/raspbian/ jessie main non-free contrib
deb-src http://mirrors.aliyun.com/raspbian/raspbian/ jessie main non-free contrib
更新系统
apt-get update&&apt-get upgrade -y