This file is indexed.

/usr/sbin/ubuntu-touch-lightdm-session is in ubuntu-touch-session 0.108+16.04.20160407-0ubuntu1.

This file is owned by root:root, with mode 0o755.

The actual contents of the file can be viewed below.

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#!/bin/sh

# /usr/sbin/lightdm-session is very X specific.  We don't want it for Ubuntu
# Touch's Mir sessions.  So determine if we are running Mir or X and do the
# right thing.  Ideally LightDM would do this for us, but in the meantime...

if [ -n "$MIR_SOCKET" ]; then
    exec $@
else
    exec /usr/sbin/lightdm-session $@
fi