Just tried with Ubuntu 7.10 the Gutsy Gibbon.
Same problem, when download is finished, there's no seeding on my end.

I get this error when trying to start Deluge when Azureus is open.
If I close Azureus, Deluge will work without error.
Perhaps it's because I've set them both on using the same port.
Make sure the port you're using is not used by another applikation

Just posting to say that I have the same problem. While downloading (leaching) a torrent, the upload speed for that torrent is as it should be (good). When download is completed, so the torrent is only being seeded, the upload speed is for the most part zero. A big problem with private trackers. Del...