(X)ubuntu alternate download false positive

I tried from 2 different torrents, still can’t get it. This is on an XP-SP3 desktop, with Avast 5.0.545, and BitTorrent 6.4

Win32:Hupigon-ONX [Trj] on:
xubuntu-10.04-alternate-i386.iso
ubuntu-9.10-alternate-i386.iso

Anyone have an idea about this, I’m thinking it’s Avast but I don’t KNOW

P.S. Sorry if this is in the wrong forum, [viruses and worms] seems the best fit to me