JavaFX: Could not find or load main class only on linux : <p>I've developed a program in Windows with Java(FX) using Intellij Idea and that worked just fine, I then exported the artifact (jar) and there was no problem running it on Windows (both with the console and double clicking it).</p>

<p>I've then copied it to my Ubuntu VM, but there it says</p>

<pre><code>Error: Could not find or load main class sample.Main
</code></pre>

<p>This is the Manifest:</p>

<pre><code>Manifest-Version: 1.0
Main-Class: sample.Main
</code></pre>

<p>The JAR file structure looks like this:</p>

<pre><code>test.jar
--- META-INF
--- --- MANIFEST.MF
--- org
--- --- json
--- --- --- // json library
--- sample
--- --- Contacts.class
--- --- Controller.class
--- --- Main.class
--- --- sample.fxml
</code></pre>
