Try making sure deja-dup-backend-gvfs is installed. That should be installed by the GUI when you first open Deja Dup preferences and click the Install button. But I think Deja Dup is confused in your case.
Try making sure deja-dup- backend- gvfs is installed. That should be installed by the GUI when you first open Deja Dup preferences and click the Install button. But I think Deja Dup is confused in your case.