If you are on a Ubuntu Linux distribution system and want to login as root user, then the first thing you should know is "the root user is disabled by default in Ubuntu for security reason" - Read the official page: https://help.ubuntu.com/community/RootSudo
So the su - command will not work.
But, If you are a part of the sudoer group (sudo) then you can make use of the sudo command to perform administrative tasks with elevated privileges.
Examples:
# sudo apt install python3
[sudo] password for mike:
Reading package lists... Done
...# sudo nano /etc/nginx/nginx.conf
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