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The error message "Unknown authentication response: 10" in the context of Postgresql with Golang indicates that the client is receiving an authentication response from the server that it does not recognize or support. The number "10" corresponds to a specific authentication message sent by the server, but the client does not know what to do with it. This error can occur if there is a version mismatch between the client and the server, or if there is an issue with the authentication method being used.