Hidden Admin User?? Cannot SU SUDO from Terminal

Do you have your system set up to let you log in automatically by any chance? Try the whoami command to see what the logged in user is from the terminal if you need to verify that. However, the way the prompt is laid out, the format is name of computer:~ username, I think. So that part you xxx'd out is what the Mac Mini thinks its network name is (which can be changes from the control panel).

EDIT: Also FWIW you should respond to the sudo challenge with your user password (the user Mac Mini -- the same p/w that user would use to login if required to provide password at login) and not a master password, if you have one established.

EDIT: Also sorry for all the edits, but you should probably try a different way of fixing escalated permissions, such as sudo bash.

Ahhh, actually I think this is your problem.

su sudo

Means to switch to the user "sudo." Unless you've established a user sudo, this attempt will always fail because, as there is no user named sudo, there is no correct password for the user named sudo. Again, try sudo bash.

Perhaps also post a screen capture.

 

That is a network issue, it is not related to the computer.
If you log in to an enterprise account which has the IP's predesignated, you will face the same issue in Terminal.

 

In Terminal, the XXXXX before your user name is the computer name. This is set in System Preferences->Sharing. You can change it there and reboot to see the difference in Terminal.

If you want to change users in terminal, you should use

Code:

su <username>

where <username> is the user you want to switch to.

If you're using

Code:

su sudo

you're trying to switch to the user "sudo" which I'm willing to bet doesn't exist. That's why it's not working. "sudo" is a different command altogether. try "man su" for more info.