Lubuntu's show.qml isn't really part of Calamares anymore; it's been modified so heavily that you can't really call it that any more.

lubuntu/branding/lubuntu/show.qml

@@ -1,20 +1,18 @@
-/* === This file is part of Calamares - <http://github.com/calamares> ===
+/*
- *
- *   Copyright 2015, Teo Mrnjavac <teo@kde.org>
  *   Copyright 2018, Lubuntu Team <lubuntu-devel@lists.ubuntu.com>
  *
- *   Calamares is free software: you can redistribute it and/or modify
+ *   This program 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 3 of the License, or
  *   (at your option) any later version.
  *
- *   Calamares is distributed in the hope that it will be useful,
+ *   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 Calamares. If not, see <http://www.gnu.org/licenses/>.
+ *   along with this software. If not, see <http://www.gnu.org/licenses/>.
  */
 
 import QtQuick 2.0;