This is probably fixed in latest debhelper, #888294 Andreas
- Bug#888816: libdbus-glib-1-doc: fails to upgrade from 'st... Andreas Beckmann
- Bug#888816: Acknowledgement (libdbus-glib-1-doc: fai... Andreas Beckmann
- Bug#888816: Acknowledgement (libdbus-glib-1-doc:... Simon McVittie