Comment 4 for bug 2036098

A nice benefit of the new xdg-desktop-portal (once #2 is fixed) is that xdg-desktop-portal-kde is no longer running by default in Lubuntu 23.10 and the LXQt desktop portal is being used instead.

It still may be a nice cleanup to have the Plasma Discover backends depend on
xdg-desktop-portal-kde | xdg-desktop-portal-backend
which hopefully will be enough to have germinate install your backend instead of the kde backend.

You will also need to add this to the Package paragraph in debian/control for xdg-desktop-portal-lxqt
Provides: xdg-desktop-portal-backend

xdg-desktop-portal-backend is a virtual package that is supposed to be provided by all the backends