/usr/share/gdm/autostart/LoginWindow/lxsession.desktop is in lubuntu-default-settings 0.27.
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 | [Desktop Entry]
Type=Application
Name=Lxsession
TryExec=/usr/bin/lxsession -s Lubuntu
Exec=/usr/bin/lxsession -s Lubuntu
OnlyShowIn=GNOME;LXDE;
X-GNOME-Autostart-Phase=Initialization
X-GNOME-Autostart-Notify=true
X-GNOME-AutoRestart=true
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