树莓派修改软件源为清华源

1、修改/etc/apt/sources.list sudo vim /etc/apt/sources.list 用#注释掉原文件内容，用如下内容取代：web deb http://mirrors.tuna.tsinghua.edu.cn/raspbian/raspbian/ stretch main contrib non-free rpi deb-src http://mirrors.tuna

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