Add sudoer and Disable Root Login Access in Ubuntu 18.04

Create a New Sudo User

$ adduser <username>
$ sudo adduser <username> sudo

disable root login.

/etc/ssh/sshd_config:

PermitRootLogin no

and the restart the ssh service

sudo service ssh restart

How to Disable Root Login Access in Ubuntu 18.04

If you want to disable root account login in your Ubuntu system then expire the password by entering the following command.

itsmarttricks@mangesh:~$ sudo passwd -l root
passwd: password expiry information changed.