树莓派4B 64位系统换清华源

• 编辑/etc/apt/sources.list文件，注释掉原内容，用以下内容替代:

# 默认注释了源码镜像以提高 apt update 速度，如有需要可自行取消注释
deb https://mirrors.tuna.tsinghua.edu.cn/debian/ buster main contrib non-free
# deb-src https://mirrors.tuna.tsinghua.edu.cn/debian/ buster main contrib non-free
deb https://mirrors.tuna.tsinghua.edu.cn/debian/ buster-updates main contrib non-free
# deb-src https://mirrors.tuna.tsinghua.edu.cn/debian/ buster-updates main contrib non-free
deb https://mirrors.tuna.tsinghua.edu.cn/debian/ buster-backports main contrib non-free
# deb-src https://mirrors.tuna.tsinghua.edu.cn/debian/ buster-backports main contrib non-free
deb https://mirrors.tuna.tsinghua.edu.cn/debian-security buster/updates main contrib non-free
# deb-src https://mirrors.tuna.tsinghua.edu.cn/debian-security buster/updates main contrib non-free

• 编辑/etc/apt/sources.list.d/raspi.list文件，注释掉原内容，用以下内容代替:

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

• 更新源

sudo apt update -y

• 更新软件包

sudo apt upgrade -y