Comment 4 for bug 557316

Eduard,
those which are aware that there is a local Debian mirror will be able to change the mirror later.

I am not sure that searching for a debian mirror on ubuntu archive will work for most of the mirrors. When there is a country code on the archive it could be translated to a debian one (http://www.debian.org/mirror/list).
Anyway I don't think using ftp.debian.org as the default hostname will be a real problem, I don't expect a massive number of people on Ubuntu installing packages from Debian. If there was some concern with load on ftp.debian.org I guess it would have some load distribution scheme.

Thanks