Ubuntu使用PPA镜像后出现无法验证的问题

W: GPG error: http://launchpad.proxy.ustclug.org trusty InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY BA6932366A755776

解决:sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys BA6932366A755776

注意后面的NO_PUBKEY的值需要相应替换

参考:https://askubuntu.com/questions/943539/the-following-signatures-couldnt-be-verified-because-the-public-key-is-not-avai

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