Upgrade to Dapper problem

[Charles Malespin]

 Hello all, 
  I am trying to upgrade from breezy to dapper through the update
manager. It started the process and then gave me the following errors..
(something like this I cant remember exactly,,,)

Network error following not found
http://koti.mbnet.fi/~ots/ubuntu/breezy/Packages.gz: 404 Not Found
http://koti.mbnet.fi/~ots/ubuntu/breezy/Sources.gz: 404 Not Found

and then shut down. My understanding is that update manager would
comment out any non official repos and that I didnt need to do anything.
Am I missing something?
Thanks, 

-- 
Charles A. Malespin
Physics Graduate Student-UL
Office: Broussard Hall Rm. 115