Package: pbuilder Version: 0.231 Nowadays only HTTPS entries are in sources.list (maybe that could unblock a fix for #790565 ?), the debconf script seems to fail to detect a mirror as described in that bugreport... and we are shown:
Here is a valid mirror example: http://deb.debian.org/debian ... which does not work when copypasted, and the user has to guess it's because it should be https:// instead.