3rd-party package conflict in upgrade of RedHat?

[greg at freephile.com (Greg Rundlett)]

I'm upgrading from rh8 to fc2 and the install warns me that there are 
3rd-party packages installed which overlap with packages included in 
fc2.  If I wish to continue this may cause the packages to not work 
properly or other system stability issues.  It tells me to see the 
Release Notes for more information, but I read the release notes and 
there is not mention of this circumstance.  I wish it would tell me more 
about *which* packages are concerned.

Unable to find any relevant info on google, I'm thinking it might just 
solve itself if I upgrade to RedHat 9, then FC2.

I don't want to do a fresh install, because I'm not at all versed in 
restoring all my personal data and preferences, and don't want to hassle 
with it.  I do have a backup of my data in case there are problems. 

Does anyone know how I would find out which 3rd-party packages FC2 is 
concerned with -- so that I might then uninstall them before the upgrade?

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