Comment 3 for bug 1642611

Patch below is also needed to play local music files thru media-hub to resolve permission error.
http://bazaar.launchpad.net/~chunsang/media-hub/unity8_include_media-hub/revision/213

"[track_list_skeleton.cpp:205@operator()] Warning: Not adding track file:///root/snap/unity8-session/common/Music/sample.mp3 to TrackList because of inadequate client apparmor permissions." from media-hub
"Failed to add 1 tracks to playlist: mpris.TrackList.Error.InsufficientPermissionsToAddTrack: Warning: Not adding track file:///root/snap/unity8-session/common/Music/sample.mp3 to TrackList because of inadequate client apparmor permissions." from unity8-dash