Comment 6 for bug 458524

I've just upgraded my server install to Karmic and now I have exactly the same problem. I have also seen Patrick Banziger's post #5 error message, but from the server, not over SSH, the first time I launched it after the upgrade. Now when I press u from aptitude I get Patrick's post #4 behaviour and error messages. Is there any information I can provide to help fix this? It's a pretty serious problem.