树莓派raspbian OS 64位系统下载与更换源

1、下载64位的raspbian
https://downloads.raspberrypi.org/raspios_arm64/images/

2、换成国内源（buster）：
把/etc/apt/sources.list所有内容替换为：

deb http://mirrors.tuna.tsinghua.edu.cn/debian buster main contrib non-free
deb http://mirrors.tuna.tsinghua.edu.cn/debian-security/ buster/updates main contrib non-free
deb http://mirrors.tuna.tsinghua.edu.cn/debian buster-updates main contrib non-free
# Uncomment deb-src lines below then 'apt-get update' to enable 'apt-get source'
#deb-src http://mirrors.tuna.tsinghua.edu.cn/debian buster main contrib non-free
#deb-src http://mirrors.tuna.tsinghua.edu.cn/debian-security/ buster/updates main contrib non-free
#deb-src http://mirrors.tuna.tsinghua.edu.cn/debian buster-updates main contrib non-free

然后在把/etc/apt/sources.list.d/raspi.list所有内容替换为：

deb http://mirrors.tuna.tsinghua.edu.cn/raspberrypi/ buster main ui
# Uncomment line below then 'apt-get update' to enable 'apt-get source'
#deb-src http://mirrors.tuna.tsinghua.edu.cn/raspberrypi/ buster main ui

4.更新

sudo apt-get update
sudo apt-get upgrade