/etc/X11/Xsession.d/99upstart 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.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 | # Start the user session
if [ -n "$UPSTART" ]; then
case "$BASESESSION" in
gnome-session*|gnome-flashback*)
export SESSIONTYPE=gnome-session
;;
lxsession*)
export SESSIONTYPE=lxsession
;;
esac
STARTUP="/sbin/upstart --user"
unset UPSTART
fi
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