记更换树莓派4B的国内软件源

 建议修改以前先备份好修改的文件，方便回滚bash # /etc/apt/sources.list.d/raspi.list # 清华 # deb https://mirrors.tuna.tsinghua.edu.cn/raspberrypi/ jessie main # 清华 # deb https://mirrors.tuna.tsinghua.edu.cn/raspberrypi/

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