do you have a /root home folder ???
you might not seeing as ubuntu dose not like root gui logins
can you boot into root user in TEXT ONLY ( init 3) boot
also A BUNCH of distros set DIFFERENT $PATH options for a normal user and for root
I do not use ubuntu so
for every distro i have used ( fedora,cent red hat , arch , suse )
the su command with the - option works
try this in the terminal
Code:
su -
-- your root password when asked ---
nautilus
some have said that this will not work on Ubuntu , i do not know .
warning -- DO NOT GET IN THE HABIT OF DOING THIS IF IT DOSE WORK !!!