I had to go to Users & Groups (in Accessories, I believe) and change User settings by adding self to the Groups
adm and, temporarily, to
root and change password. I then Ctrl-Alt-F2 'ed and
PHP Code:
sudo passwd root
to add a
root password.
Just enter the newly created User password at the prompt for the command, then enter the desired UNIX password for root, twice.
It rebooted nicely after doing the above.
Hope this helps! Give another holler if not -- I'll check back later.