[Debian-on-mobile-maintainers] Bug#1038858: modemmanager: Unknown option: runtime

[AlMa]

Package: modemmanager
Version: 1.20.4-1

While removing ModemManager (because I neither use nor intend to use 
WWAN), I get a message “Unknown option: runtime”:

Entfernen von libmbim-utils (1.28.2-1) ...
Entfernen von libqmi-utils (1.32.2-1) ...
Entfernen von modemmanager (1.20.4-1) ...
Unknown option: runtime
Entfernen von xbrlapi (6.5-7) ...

In plain English, what does this message tell me?  Who is the culprit, 
whom to blame, and what to do?

Gratefully,
AlMa