树莓派清华源主页：
https://mirrors.tuna.tsinghua.edu.cn/help/raspbian/
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| sudo echo -e "deb http://mirrors.tuna.tsinghua.edu.cn/raspbian/raspbian/ buster main non-free contrib\ndeb-src http://mirrors.tuna.tsinghua.edu.cn/raspbian/raspbian/ buster main non-free contrib\n" > /etc/apt/sources.list
sudo echo -e "deb http://mirrors.tuna.tsinghua.edu.cn/raspberrypi/ buster main ui" > /etc/apt/sources.list.d/raspi.list
sudo apt-get update
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https://mirrors.tuna.tsinghua.edu.cn/help/raspberrypi/