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We set up root password for making our Linux administration life easier. But enabling root login is a security risk. So after we're done setting up our Linux system, we should/can remove root password and disable root login. This is the topic of this post.
Disable root Login
To disable root login or removing root password, run the following command.
sudo passwd -l root
passwd: password expiry information changed.
Now if you try to login as root, you shouldn't be able to login.
su: Authentication failure
Ubuntu Forums (https://ubuntuforums.org/showthread.php?t=1204751)
Tested on: Ubuntu 16.04 LTS