Nepomuk wants Virtuoso, can't locate package.

[Dave Thacker]

Version:Kubuntu 10.04

I keep getting this error "Nepomuk Semantic Desktop needs the Virtuoso RDF 
server to store its data.  Installing the Virtuoso Soprano"   

-I think there is more to the message, but I'm unable to scroll or change the 
number of lines in the notification dialog box.
-I searched for Virtuoso in KPackageKit, but got no results

Please advise.  TIA

Dave