Comment 1 for bug 1767319

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Abraham MacĂ­as Paredes (amp-21004) wrote : Re: debootstrap on Xenial creates broken install for Bionic related to gnupg1/gnupg2 apt-key dependencies

The same thing happens when debootstrap is used under Debian 9.

A workaround for this is using: --include=gnupg2

If you are using "lb build" you can configure it like this:
 lb config --debootstrap-options="--include=gnupg2"

I think that the correct package to use must be gnupg2 according to this wiki:
  https://wiki.ubuntu.com/BionicBeaver/ReleaseNotes#Other_base_system_changes_since_16.04_LTS

Best regards!