Note, that building a Xenial pbuilder environment works with the commands and configuration above (with DISTRIBUTION=xenial in /etc/pbuilerrc). So, apt-key seems to still need gpg in Bionic and Cosmic, and apt-key either needs a fix or have the dependency on gpg.
Note, that building a Xenial pbuilder environment works with the commands and configuration above (with DISTRIBUTION=xenial in /etc/pbuilerrc). So, apt-key seems to still need gpg in Bionic and Cosmic, and apt-key either needs a fix or have the dependency on gpg.