Installing extensions on Linux machines results in failure

[Praburaj]

I have been trying to extend the ARM template that installs a Kafka cluster on Ubuntu machines.
Original sample: https://github.com/Azure/azure-quickstart-templates/tree/master/kafka-ubuntu-multidisks

However on executing the template I often see the execution flaky resulting in these error messages marking the VM extension installation a failed task. What's the best way for me to look at the failure reason?

Often run into this error, but some times does not happen on retries. 
{
    "status": "Failed",
    "error": {
        "code": "ResourceDeploymentFailure",
        "message": "The resource operation completed with terminal provisioning state 'Failed'.",
        "details": [
            {
                "code": "VMArtifactRepositoryInternalError",
                "message": "An internal error occurred while retrieving the VM artifact data from the artifact repository."
            }
        ]
    }
}

Some times I also get this: 
{
    "status": "Failed",
    "error": {
        "code": "ResourceDeploymentFailure",
        "message": "The resource operation completed with terminal provisioning state 'Failed'.",
        "details": [
            {
                "code": "VMExtensionProvisioningError",
                "message": "VM has reported a failure when processing extension 'chefclient'. Error message: \"private key does not match certificate - Check log file for details\"."
            }
        ]
    }
}

[aarsan]

I am starting to get this same error pretty consistently now. Just got it 4 times in a row but worked on the 5th try.

[bingosummer]

@Praburaj
Closing the issue. Please feel free to re-open it if the issue still exists.