This file is indexed.

/etc/apparmor.d/lightdm-guest-session is in lightdm 1.18.1-0ubuntu1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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# vim:syntax=apparmor
# Profile for restricting lightdm guest session

#include <tunables/global>

/usr/lib/lightdm/lightdm-guest-session {
  # Most applications are confined via the main abstraction
  #include <abstractions/lightdm>

  # chromium-browser needs special confinement due to its sandboxing
  #include <abstractions/lightdm_chromium-browser>
}