how to remove root user and go back to sudo-only

[David Williamson]

I added a root user after initial install, because that's what I'm used
to.  If I want to kill it and go back to sudo-only with no root, how do
I do it?

I can tell you this - don't do it this way!  Don't think you can
edit /etc/shadow and /etc/passwd, delete the root entries (backing up
the original shadow and passwd files just in case), and log out and
back.  sudo and su won't work anymore :-)  <doh!>  Good think I had a
knoppix disk to make things right.

So, evidently there normally IS a root user, even though he's not used
the same way as some of us are used to?  And how would I go back to the
default ubuntu behaviour?

TIA -

david williamson