The Software Update Stack was updated to receive fixes and enhancements. libzypp: - Adapt to work with GnuPG 2.1.23. - Support signing with subkeys. - Enhance sort order for media.1/products. zypper: - Also show a gpg key"s subkeys. - Improve signature check callback messages. - Add options to tune the GPG check settings. - Adapt download callback to report and handle unsigned packages. - Report missing/optional files as "not found" rather than "error"