@Keneda
Yes you are right, pleae apologizy the misprint, it should be service ...
Summarizing the procedure is as shown in https://docs.ubports.com/en/latest/userguide/advanceduse/ssh.html:
chmod 700 /home/phablet/.ssh
chmod 600 /home/phablet/.ssh/authorized_keys
chown -R phablet:phablet /home/phablet/.ssh
and after this modification, stop and restart of the ssh-server
sudo service ssh stop
sudo service ssh start
systemctl status ssh