Google Cloud Setting
Enter root to change the password
◦ type “sudo su root” the enter
◦ type “sudo passwd root” then enter to change your password,
SSH Configuration
◦ type “nano /etc/ssh/sshd_config”, find “PermitRootLogin“, change to yes.
◦ scroll again and find “PasswordAuthentication no” and change no to yes.
◦ Save file, ctrl+x and type y then nter
◦ Restart “sudo service sshd restart“.