树莓派更换源

系统版本：2017-11-29-raspbian-stretch-lite

编辑/etc/apt/sources.list：

#deb http://mirrordirector.raspbian.org/raspbian/ stretch main contrib non-free rpi
# Uncomment line below then 'apt-get update' to enable 'apt-get source'
#deb-src http://archive.raspbian.org/raspbian/ stretch main contrib non-free rpi

deb http://mirrors.tuna.tsinghua.edu.cn/raspbian/raspbian/ stretch main non-free contrib
deb-src http://mirrors.tuna.tsinghua.edu.cn/raspbian/raspbian/ stretch main non-free contrib

编辑/etc/apt/sources.list.d/raspi.list：

#deb http://archive.raspberrypi.org/debian/ stretch main ui
# Uncomment line below then 'apt-get update' to enable 'apt-get source'
#deb-src http://archive.raspberrypi.org/debian/ stretch main ui

deb http://mirrors.ustc.edu.cn/archive.raspberrypi.org/ stretch main ui
deb-src http://mirrors.ustc.edu.cn/archive.raspberrypi.org/ stretch main ui