//更改apt源
$ sudo cp /etc/apt/sources.list /etc/apt/sources.list.bak
$ sudo echo "" > /etc/apt/sources.list
$ sudo nano /etc/apt/sources.list //編輯sources.list添加如下內容
deb http://mirrors.ustc.edu.cn/raspbian/raspbian/ buster main contrib non-free rpi
deb-src http://mirrors.ustc.edu.cn/raspbian/raspbian/ buster main contrib non-free rpi
$ sudo apt-get update //更新軟件包索引
$ sudo apt-get upgrade //更新軟件包(可選)
//更改系統源
$ sudo cp /etc/apt/sources.list.d/raspi.list /etc/apt/sources.list.d/raspi.list.bak
$ sudo echo "" > /etc/apt/sources.list.d/raspi.list
$ sudo nano /etc/apt/sources.list.d/raspi.list //編輯raspi.list添加如下內容
deb http://mirrors.ustc.edu.cn/archive.raspberrypi.org/ buster main ui