Comment 1 for bug 1399936

I see that this may be similar to some of the following:
https://github.com/mate-desktop/mate-settings-daemon/issues/44
https://bugzilla.redhat.com/show_bug.cgi?id=753882
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=766464

Although permissions of /run/user/1000/dconf/user look OK to me.

Well beyond my capacities to debug further.