报错There is no public key available for the following key IDs,解决办法如下:
执行指令

sudo apt-get install debian-keyring debian-archive-keyring -y
apt-key update

然后就可以正常执行apt-get的update等操作了。

解决办法来自:
http://tilt.lib.tsinghua.edu.cn/node/463

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