Comment 13 has done the trick for me. All works after installing gnome- raw-thumbnailer and adding the config.
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/852923 Title: gnome-raw-thumbnailer doesn't do anything To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-raw-thumbnailer/+bug/852923/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs