How to change root password in Ubuntu
The procedure to change the root user password on Ubuntu Linux:
Type the following command to become root user and issue passwd:
sudo -i passwd
OR set a password for root user in a single go:
sudo passwd root
Test it your root password by typing the following command:
su -
How to disable your root account on Ubuntu
One can disable the root account by typing the following command:
$ sudo passwd -dl root
OR
$ sudo passwd --delete --lock root
Ref:
https://www.cyberciti.biz/faq/change-root-password-ubuntu-linux/
I am lazy, so just refer to a document from internet.
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