/etc/profile.d/upstart-phablet.sh is in ubuntu-touch-session 0.108+16.04.20160407-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 | # Join the phablet Upstart session
if [ "$USER" != "root" ]
then
uid=$(getent passwd "$USER"|cut -d: -f3)
export XDG_RUNTIME_DIR="/run/user/$uid"
export UPSTART_SESSION=$(/sbin/initctl list-sessions | awk '{ print $NF; quit }')
fi
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