I would like to cleanly shut my system down but the response from 'shutdown -P now' is that I need to be logged in as root. I installed the 'root' command but I get an error message that 'root: cannot figure out DISPLAY, set it manually'. Since this didn't work I tried logging in as root (user name) and I realize I don't know the password. So I have two questions. One, on initial installation what does the root password become? Two, what do I do about the DISPLAY problem?
First of all: you don't have to know the root's password, use your own with
If you need a password for root, then issue: