/etc/X11/Xsession.d/50autolock is in gpe-login 0.95-2ubuntu1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 | #!/bin/sh
. /etc/sysconfig/gpelogin
if [ "$AUTOLOGIN" != "true" ] ; then
GTK2_RC_FILES=/etc/X11/gpe-login.gtkrc gpe-login --autolock &
fi
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