Bill, could this be your problem?
https://wiki.x2go.org/doku.php/doc:faq:start
Known Issues
Can't login to x2goserver with an ECDSA key
Currently, older versions of the ssh library used by X2Go called libssh are
unable to work with ECDSA keys. However you may use an RSA key - if you
need to - o
The error is exactly as here: [X2Go-User] X2Go Client: Kex error : no match for
method server host key alog: server [ssh-rsa], client [ssh-ed25519]
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[X2Go-User] X2Go Client: Kex error : no match for method server host key...
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However, I have some more information which s