Comment 21 for bug 114957

I got the same error but under difference circumstances:

A few weeks ago I installed a fresh copy of Ubuntu 11.04 Alpha 3 (Natty Narwhal) and just now am receiving a "partial upgrade". (Doesn't Beta 1 come out next week?) When I accepted the upgrade I got the "Can't install ubuntu-desktop" error but no other errors. I'm am still upgrading as I write, so I will update this thread if I get any other errors.