Nowadays gpa Depends: on gnupg which then Depends: on gpg-wks-server, gpg-wks-client, gpgsm, gnupg-utils, gnupg-l10n.
Unfortunately, GPA will have to be removed from Whonix 18, as it has been removed from Debian Trixie due to lack of maintenance. See Debian Package Tracker, https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1089914. The suggested replacement, KDE’s Kleopatra, pulls in somewhere around 280 MB of dependencies due to reliance on KDE libraries.
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