The root access in Ubuntu gives you full access to edit configuration files and other administrative tasks. Here's how to log in as root.

The normal installation of most distros enables the first user created to have sudo rights to everything, without ever having to log in as root or spread the root password.

Also: The best Linux distros for beginners With sudo in place, users no longer had to change to the root user or log in to that account to run administrative commands, such as installing software.

Once the user logs out and logs back in, they will have full access to sudo. At this point, you no longer have to log into your Debian minimal server as root to get things done.

The root can do everything but login, and specific users get the privilege to do certain things. sudo XKCD #149 (CC by SA 2.5) In the Linux world, sudo is very common.

The bug allows users to bypass privilege restrictions to execute commands as root. A vulnerability in Sudo, a core command utility for Linux, could allow a user to execute commands as a root user ...