树莓更换国内镜像源

更换国内镜像源--清华源(https://mirror.tuna.tsinghua.edu.cn/help/raspbian/)

sudo nano /etc/apt/sources.list

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

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

sudo nano /etc/apt/sources.list.d/raspi.list

deb http://mirrors.tuna.tsinghua.edu.cn/raspberrypi/ buster main ui