更新 22.0.4 时出现 NO_PUBKEY 错误

更新 22.0.4 时出现 NO_PUBKEY 错误
An error occurred during the signature verification. 
The repository is not updated and the previous index files will be used. 
GPG error: http://security.ubuntu.com/ubuntu xenial-security InRelease: 
The following signatures couldn't be verified because the public key is not available: 
  NO_PUBKEY 40976EAF437D05B5 NO_PUBKEY 3B4FE6ACC0B21F32

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