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W: GPG error: https://mirrors.aliyun.com/kubernetes/apt kubernetes-xenial InRelease: The following signatures couldn’t be verified because the public key is not available: NO_PUBKEY FEEA9169307EA071 NO_PUBKEY 8B57C5C2836F4BEB
W: The repository ‘https://mirrors.aliyun.com/kubernetes/apt kubernetes-xenial InRelease’ is not signed.
N: Data from such a repository can’t be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.

安装GPG秘钥:
curl https://mirrors.aliyun.com/kubernetes/apt/doc/apt-key.gpg |sudo apt-key add -
错误消失

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