Here is a comment from #834330 that might be helpful:
Also, do you require signing of the internal dummy repository in the
first place? If not, you can just delete /var/lib/sbuild/apt-keys and
then sbuild will stop trying to sign the internal repository. Having
it signed is only necessary for apt versions in squeeze or older.
Since wheezy, apt supports the [trusted=yes] option in its
sources.list.
Greetings
Marc
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