@the_duke You are getting an rpc error that indicates the showmount command could not connect to the server on its loopback interface. So that tells me that nfs is not installed for some reason or the services needed for nfs are not running. I don’t know ubuntu so I can’t give you step by step checks. But if showmount -e 127.0.0.1 is giving an RPC error then its not talking.
You can also review the /etc/exports file but the shares are not the problem at the moment.