/usr/sbin/lightdm-unity8-session is in unity8-desktop-session-mir 1.0.10+14.04.20140417.1-0ubuntu1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 | #!/bin/sh
#
# If no X server is available, just run upstart, otherwise fall back to the
# traditional X-based desktop session startup.
#
if test -z "$DISPLAY"; then
exec init --user
else
exec /usr/sbin/lightdm-session "$@"
fi
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