Comment 8 for bug 1779289

We believe that should be fixed by those commits

* https://gitlab.gnome.org/GNOME/gnome-bluetooth/commit/e807cbd8
 client: Fix bluetooth_client_set_trusted() not working

(that would probably explain the LinkKey section missing from the config)

* https://gitlab.gnome.org/GNOME/gnome-bluetooth/commit/4f1e0b35
' lib: Always try to pair pointer devices '

Those fixes are in 3.32 in disco and I've uploaded a bionic SRU now
https://launchpadlibrarian.net/418989286/gnome-bluetooth_3.28.0-2ubuntu0.2_source.changes

(the SRU needs to be reviewed/accepted next)