今天在更新运行apt-get update的时候出现了如下的错误:
W: GPG error: https://extras.ubuntu.com trusty Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY F60F4B3D7FA2AF80W: GPG erro
阅读背景：
GPG error: https://extras.ubuntu.com trusty Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY F60F4B3D7FA2AF80
来源：互联网
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