Virtual package gsettings-backend is provided by:
dpkg-query: no packages found matching gconf-gsettings-backend Desired=Unknown/Install/Remove/Purge/Hold | Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend ||/ Name Version Architecture +++-=============================-==========-==================================== ii dconf-gsettings-backend:amd64 0.40.0-4 amd64 simple configuration storage system - GSettings back-end 1 packages