Comment 3 for bug 919356

I believe I've fixed this for real now - my test netboot installer image certainly behaves much more sensibly - but I'd appreciate testing. Please note that, although this bug will be closed when I upload the new choose-mirror package, test images won't be available until after the next debian-installer and ubiquity uploads (for netboot/alternate/server and desktop install types respectively). These happen pretty frequently so it should be possible to test something within the next few days.