Trouble Logging In as Root

[hippie dream]

Hello,

I am having trouble logging in as root on a fresh install of Ubuntu 8.10.
During the setup process, I was prompted to give a password which I can use
perfectly to install programs and make most changes. However, I think the
system only set me up as a administrator because when I try to login as root
I receive this message:

sam at sam-laptop:~$ su root
Password: 
su: Authentication failure
sam at sam-laptop:~$ 

Am I missing something really obvious here? How can setup my computer so
that I can login as root? I have all my files backed up so if another fresh
install is required that is certainly as possibility. 

Thanks for your help.

Sam
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