/etc/ssh/sshd_conf
ChallengeResponseAuthentication no
PasswordAuthentication no
UsePAM no
sudo service ssh restart
ChallengeResponseAuthentication yes
PasswordAuthentication yes
UsePAM yes
/etc/ssh/ssh_config
ForwardAgent yes
ForwardX11 yes
ForwardX11Trusted yes
/etc/ssh/sshd_config
X11Forwarding yes
X11DisplayOffset 10
sudo service ssh restart
/etc/sudoers
youruser ALL=(ALL) NOPASSWD:ALL