AFAICS this is fixed in 2017.7.ubuntu1:
debian-archive-keyring (2017.7ubuntu1) bionic; urgency=medium
* Do not trust debian archive keys by default, and instead ship those
keys in usr/share/keyrings. On Ubuntu, this package is mostly used for
validating chroots when debootstrapping Debian using
/usr/share/keyrings/debian-archive-keyring.gpg
-- Dimitri John Ledkov <[email protected]> Tue, 16 Jan 2018 16:52:37
+0000
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https://bugs.launchpad.net/bugs/1685305
Title:
Debian keys should not be trusted by default
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