What is your distro?
(place your distro and location in your profile - "edit profile" in the "My LQ" menue on the right >>>--->)
Basically, a root user should have been created when you installed. You can boot into the superuser from the login screen by typing "root" for the username.
You can "switch user" to root in a user console using the "su" command.
However, some distros disable the root user by default. In which case, the first created user is the administrative user. You can issue admin commands from a console using "sudo". If you want this to be a root terminal, you will probably get away with "sudo su".
Any administrative tasks you want to attempt from the gui will prompt you for a password.
All this is for security.
In general, you should not need log in as root to do anything.
So the question is: what do you need superuser(s) for?
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