I needed to re-install ssh server on ubuntu.eskimo.com because there was a problem with the existing installation that caused it not to re-start automatically upon reboot.

     The result is the openssh encryption keys will have changed.  You can remove the old key from your .ssh/known_servers with:

     ssh-keygen -f “/home/nanook/.ssh/known_hosts” -R “ubuntu.eskimo.com”

     You will also be prompted if you use x2go.  Do not worry, this is NOT a man in the middle attack, it is simply an installation problem that needed to be corrected.