1
lsb_release -c

1
sudo nano /etc/apt/sources.list
2
deb https://mirrors.ustc.edu.cn/raspbian/raspbian/ buster main contrib non-free
3
deb-src https://mirrors.ustc.edu.cn/raspbian/raspbian/ buster main contrib non-free
4
#deb http://raspbian.raspberrypi.org/raspbian/ buster main contrib non-free rpi
5
sudo nano /etc/apt/sources.list.d/raspi.list
6
deb http://mirrors.ustc.edu.cn/archive.raspberrypi.org/debian/ buster main ui
7
deb https://mirrors.tuna.tsinghua.edu.cn/raspberrypi/ buster main ui
8
#deb http://archive.raspberrypi.org/debian/ buster main

1
sudo apt update
2
sudo apt upgrade
3
sudo apt dist-upgrade