This file is indexed.

/etc/upstart-xsessions is in upstart 1.13.2-0ubuntu21.

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

The actual contents of the file can be viewed below.

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# xsessions listed below are run inside an Upstart user session.
gnome
gnome-classic
gnome-fallback
gnome-flashback-metacity
gnome-flashback-compiz
kde-plasma
Lubuntu
Lubuntu-Netbook
lubuntu-nexus7
lxgames
qlubuntu
ubuntu
ubuntustudio
xfce
xubuntu
unity8-x11
unity8-mir