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This allows running `systemctl --user enable rygel` in order to automatically launch rygel at login. The default behavior is not changed. If lingering is also enabled for the user, rygel will be started at boot; this will then share media without needing a session. Since this disregards whether GSD would have launched rygel, it is primarily useful for headless servers and avoids the wrap-dbus hack used by the example system service. https://bugzilla.gnome.org/show_bug.cgi?id=766332
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