1.修改软件更新源 sudo nano /etc/apt/sources.list deb http://mirrors.ustc.edu.cn/raspbian/raspbian/ buster main contrib non-free rpi 2.更改系统更新源 sudo nano /etc/apt/sources.list.d/raspi.list deb http://mirrors.ustc.edu.cn/raspbian/raspbian/ buster main 3.同步更新源