Package: gnupg Version: 2.1.14-5 Severity: serious For at least #782904 and possibly other packages proper Breaks/Conflicts are required for all packages where old versions (especially the versions in stable) were broken to ensure that these packages get upgraded to fixed versions when the gnupg package is updated to the version based on gnupg2.
Otherwise users might be left with a broken combination of packages in various partial upgrade, backport and Debian-derived distribution scenarios.