Package: wireplumber Followup-For: Bug #1032351 Package 'dbus-user-session' is-and-was also present on the system:
$ apt list dbus-user-session Listing... Done dbus-user-session/testing,now 1.14.6-1 amd64 [installed] However, some of the systemd user files were missing from the filesystem. In particular, '/usr/lib/systemd/user/dbus.service' was not there. To remedy that, I've re-installed the 'dbus-user-session' package: $ sudo apt install --reinstall dbus-user-session The problem isn't entirely resolved yet; it might be necessary to auto-enable dbus in the systemd user session.