Hi Gerald_clark!
I was having some problems with the repo mirror, getting only aria2 and lftp... very strange... This is ok now.
Regarding the aria2, I solved the problem: it was caused by the dht point. Just downloaded a "trusted" torrent (like the iso from ubuntu) and the the aria2 started to respond for magnet links from other sites. (there was no need to finish the torrent file from canonical).
This way the Yaaw web interface for aria2 started to work ok too.
Thanks!