/usr/share/upstart/sessions/media-hub.override is in lxc-android-config 0.230+16.04.20160328-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | env CORE_UBUNTU_MEDIA_SERVICE_AUDIO_SINK_NAME=pulsesink
export CORE_UBUNTU_MEDIA_SERVICE_AUDIO_SINK_NAME
env CORE_UBUNTU_MEDIA_SERVICE_VIDEO_SINK_NAME=mirsink
export CORE_UBUNTU_MEDIA_SERVICE_VIDEO_SINK_NAME
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