gsettings set org.gnome.desktop.interface toolkit-accessibility true fails

My docker script executes the following two commands gsettings set org.gnome.desktop.interface toolkit-accessibility true gsettings get org.gnome.desktop.interface toolkit-accessibility The first command runs (silently) but the second command returns false. What sort of reasons would cause gsettings set org.gnome.desktop.interface toolkit-accessibility to fail? What should I be looking at? I have installed dbus-x11 and unsuccessfully tried to start the dbus-daemon as follows, but I'm not sure I am doing the right thing. dbus-daemon --system dbus-daemon: Failed to start message bus: Failed to bind socket "/run/dbus/system_bus_socket": No such file or directory