le-multiterminal: Fix "black screen" after upgrade

When user tries to upgrade from LE 5.0.0 to 5.0.2 he would get a black
screen.

Signed-off-by: Diego Giovane Pasqualin <dpasqualin@c3sl.ufpr.br>

le-multiterminal/package/DEBIAN/control

 Package: le-multiterminal
 Priority: important
 Section: main
-Version: 0.0.24
+Version: 0.0.26
 Maintainer: LE Maintainer <le-maintainer@c3sl.ufpr.br>
 Description: Userful multiplier for Linux Educacional 5
 Architecture: all

le-multiterminal/package/etc/le-autoupgrade/exec/fix-lightdm-conf

+#!/bin/bash
+#
+# Copyright (C) 2004-2012 Centro de Computacao Cientifica e Software Livre
+# Departamento de Informatica - Universidade Federal do Parana - C3SL/UFPR
+#
+# This file is part of le-multiterminal
+#
+# le-multiterminal is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License
+# as published by the Free Software Foundation; either version 2
+# of the License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
+# USA.
+
+# When upgrading from old LE versions to the current one we have been facing
+# an annoying problem. Basically after upgrading and rebooting the system
+# the screen goes black and the user cannot interact with the computer. This
+# is caused because the userful-multiseat trigger that modify the config
+# file /etc/lightdm/lightdm.conf for some reason is not fired properly after
+# the upgrade, and the multiseat config is not set correctly on that file.
+#
+# Reinstalling le-conf will trigger the userful-multiseat package and make
+# sure all necessary options are set on lightdm.conf.
+
+# FIXME the right way to do this would be find out why the trigger is not
+# being called in the first place.
+
+echo "Reinstalling le-conf to fix lightdm.conf"
+apt-get install --reinstall le-conf || true
+
+# This script is supposed to run only once
+rm -f $0
+
+exit 0