报错信息：
W: GPG error: http://ppa.launchpad.net trusty InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 8CF63AD3F06FC659
解决：
sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 8CF63AD3F06FC659
转载于:https://www.cnblogs.com/sea-stream/p/11027576.html
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