[embed_url: https://raw.githubusercontent.com/panticz/lxc/master/create_ubuntu_xenial.sh]

Allow root SSH login with password

sed -i 's|PermitRootLogin without-password|PermitRootLogin yes|' /etc/ssh/sshd_config
sed -i 's|PasswordAuthentication no|PasswordAuthentication yes|' /etc/ssh/sshd_config
service ssh restart