Use the background image given by arraybolt3.

README.md

@@ -4,4 +4,6 @@ This project is in **VERY VERY EARLY ALPHA**. It doesn't even do anything yet.
 
 Eventually it's going to present a "Try or Install Lubuntu" menu.
 
-Licensing info: 2022 Lubuntu Developers <lubuntu-devel@lists.ubuntu.com>
+Licensing info:
+ - Everything is GPL-3 by 2022 Lubuntu Developers <lubuntu-devel@lists.ubuntu.com> unless stated otherwise.
+ - img/background.png is licensed CC-BY-4.0, authored by Aaron Rainbolt <arraybolt3@gmail.com>, copyright ownership the same as source

src/mainwindow.cpp

@@ -8,7 +8,7 @@ MainWindow::MainWindow(QWidget *parent)
     ui->setupUi(this);
 
     // Set the background image, and let it change with the release
-    QPixmap bg("/usr/share/lubuntu/wallpapers/lubuntu-default-wallpaper.png");
+    QPixmap bg("../img/background.png");
     bg = bg.scaled(this->size(), Qt::IgnoreAspectRatio);
     QPalette palette;
     palette.setBrush(QPalette::Window, bg);