Lars, I did wipe the whole machine and then followed the tutorial from this site tutorial
In the ssh conf file I had the following set
passwordauthentication no I commented this out and could then ssh from MAC to server.
I am now struggling to get Ubuntu to send emails etc. I have tried ssmtp and msmtp to use a Gmail account, and get similar problems;
currently, with ssmtp programmed, if I type;
echo 'Hello from Server' | mail -s 'Hello from Server' email@example.com
I get the following error;
mail: cannot send message: Process exited with a non-zero status
Googling hasn't helped me thus far ……. do you have any pointers that would help me ?