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1.W: GPG error: http://extras.ubuntu.com trusty Release: The following signatures couldn‘t be verified because the public key is not available: NO_PUBKEY 16126D3A3E5C1192
apt-key adv --keyserver keyserver.ubuntu.com --recv-keys <KEY>
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原文地址：http://www.cnblogs.com/multi-task/p/5756389.html
