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.