更换Raspbian Buster源
sudo nano /etc/apt/sources.list
deb http://mirrors.tuna.tsinghua.edu.cn/raspbian/raspbian/ buster main contrib non-free rpi deb-src http://mirrors.tuna.tsinghua.edu.cn/raspbian/raspbian/ buster main contrib non-free rpi
sudo apt-get update
https://www.jianshu.com/p/cf35fb2afabc