一.错误描述 W: GPG error: http://ppa.launchpad.net/fkrull/deadsnakes/ubuntu xenial InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 5BB92C09DB82666C 二.错误原因及解决办法 是PGP证书的问题,解决方法如下: gpg --keyserver w…