樹莓派最新的系統版本是stretch,試了阿里和網易的軟件源都不行,最後試了清華的能夠軟件
deb http://mirrors.tuna.tsinghua.edu.cn/raspbian/raspbian/ stretch main contrib non-free rpi deb-src http://mirrors.tuna.tsinghua.edu.cn/raspbian/raspbian/ stretch main contrib non-free rpi