I don't spot anything in your code that helps debugging this further.

The error comes from the other end, that the username (newroot) does not match the pubkey/private key pair.

Maybe look at the remote end, and/or check whether a different username gives a different error.

In reply to Re^9: Net::SSH2 not base64 encoded by Corion
in thread Net::SSH2 not base64 encoded by averlon

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