Problem upgrading from 7.10 to 8.04

[Brian Lunergan]

Greetings folks:

I've been trying upgrade to the new edition of Ubuntu but keep running into 
a problem. The process gets to the last file to download, tries three times 
then spits out this error before rolling back the action to that point.

Failed to fetch 
http://ca.archive.ubuntu.com/ubuntu/pool/main/p/python2.5/python2.5-dbg_2.5.2-2ubuntu4_i386.deb 
Hash Sum mismatch

Any thoughts? Is there a way around this?

Regards...
-- 

Brian Lunergan
Nepean, Ontario
Canada