/usr/share/lightdm/lightdm.conf.d/52-ubuntu-touch.conf 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 | [SeatDefaults]
type=unity
user-session=ubuntu-touch
session-wrapper=/usr/sbin/ubuntu-touch-lightdm-session
unity-compositor-command=/usr/share/ubuntu-touch-session/usc-wrapper
[LightDM]
minimum-vt=1
|