** 玩联想云，装的Armbian系统，旧源不能用，换！**
文件路径：/etc/apt/sources.list
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| deb http://mirrors.ustc.edu.cn/debian stretch main contrib non-free
deb http://mirrors.ustc.edu.cn/debian stretch-updates main contrib non-free
deb http://mirrors.ustc.edu.cn/debian stretch-backports main contrib non-free
deb http://mirrors.ustc.edu.cn/debian-security/ stretch/updates main contrib non-free
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原文地址：https://www.jianshu.com/p/beee8054c560
