migrate-pubring-from-classic-gpg --version (return code: 0)
There is no --version/pubring.gpg, no need to migrate
migrate-pubring-from-classic-gpg --help (return code: 0)
Usage: /usr/bin/migrate-pubring-from-classic-gpg [GPGHOMEDIR|--default]
Migrate public keyring in GPGHOMEDIR from "classic" to "modern" GnuPG
using gpg version 2.1.
--default migrates the GnuPG home directory at "/home/samuel/.gnupg"