I am the super-user dammit!

[fwc]

I find it strange that they told you to disable the root user in installation, I thought it was suppose to be on. I think the only way to test whether you are really root is to go into the terminal and try typing fdisk -l and see if it accepts the command. If it does not accept than you are not the admin and must type sudo fdisk -l where it should prompt you for a password. the -l is a lower case L. Hope this helps, and maybe someone knows more who can guide you better.

[proxima_centauri]

Even though you are the only user, you still are a normal user. To become "super user" you need to issue the command

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sudo

before any other command in terminal. For instance instead of running

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fdisk -l

you need to use

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sudo fdisk -l

[Aging Technogeek]

You don't need to have the root password enabled to do anything in Mint. When it asks you for a password, just enter the password you chose during the installation. This gives you superuser privileges for the action you are performing.