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# install
apt install openssh-server
# config
cp /etc/ssh/sshd_config /etc/ssh/sshd_config-bak
echo "PermitRootLogin yes" > /etc/ssh/sshd_config
# start
sudo service ssh start
# OR
# sudo /etc/init.d/ssh start
# OR for systemd based Ubuntu Linux 16.04 LTS or above server:
# sudo systemctl start ssh