No audio on Linux (Bazzite 42)

I've just installed open-ig onto **Bazzite 42 linux** distro, and the game (including the videos too) is **completely mute**. None of the videos or the user interactions has any sound.

When I try to adjust **Music** or **Video volume** in **Settings / Audio**, I get the following error:

```
An unexpected error occurred.
You should consider submitting an error report via the project issue list:
https://github.com/akarnokd/open-ig/issues
Please include the following diagnostic information followed by the error stacktrace(s):
Java version: 24.0.2
Java vendor: Homebrew (https://github.com/Homebrew/homebrew-core/issues)
Java class version: 68.0
Operating system: Linux, amd64, 6.15.9-106.bazzite.fc42.x86_64
Game version: 0.95.263
Command line: [-memonce, -en]
Available memory: 154 MB
Maximum memory: 832 MB
Parallelism: 12
Language: hu
Date and time: 2025-08-31T12:36:05.325Z
----
A crash save may have been created. Please attach it in the issue report (zipped).
javax.sound.sampled.LineUnavailableException: line with format PCM_SIGNED 22050.0 Hz, 16 bit, mono, 2 bytes/frame, little-endian not supported.
at java.desktop/com.sun.media.sound.DirectAudioDevice$DirectDL.implOpen(DirectAudioDevice.java:480)
at java.desktop/com.sun.media.sound.AbstractDataLine.open(AbstractDataLine.java:115)
at java.desktop/com.sun.media.sound.AbstractDataLine.open(AbstractDataLine.java:142)
at hu.openig.sound.Sounds.addLine(Sounds.java:177)
at hu.openig.sound.Sounds.getLine(Sounds.java:192)
at hu.openig.sound.Sounds.playSound(Sounds.java:260)
at hu.openig.sound.Sounds.playSound(Sounds.java:239)
at hu.openig.screen.CommonResources.playSound(CommonResources.java:1086)
at hu.openig.screen.ScreenBase.effectSound(ScreenBase.java:311)
at hu.openig.screen.items.LoadSaveScreen$AuidoSettingsPanel$7.mouse(LoadSaveScreen.java:1733)
at hu.openig.ui.UIContainer.mouse(UIContainer.java:112)
at hu.openig.ui.UIContainer.mouse(UIContainer.java:112)
at hu.openig.ui.UIContainer.mouse(UIContainer.java:112)
at hu.openig.screen.ScreenBase.mouse(ScreenBase.java:113)
at hu.openig.screen.items.LoadSaveScreen.mouse(LoadSaveScreen.java:682)
at hu.openig.GameWindow$MouseActions.invoke(GameWindow.java:1137)
at hu.openig.GameWindow$MouseActions.mouseReleased(GameWindow.java:1187)
at java.desktop/java.awt.Component.processMouseEvent(Component.java:6576)
at java.desktop/javax.swing.JComponent.processMouseEvent(JComponent.java:3404)
at java.desktop/java.awt.Component.processEvent(Component.java:6341)
at java.desktop/java.awt.Container.processEvent(Container.java:2260)
at java.desktop/java.awt.Component.dispatchEventImpl(Component.java:4958)
at java.desktop/java.awt.Container.dispatchEventImpl(Container.java:2318)
at java.desktop/java.awt.Component.dispatchEvent(Component.java:4790)
at java.desktop/java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4916)
at java.desktop/java.awt.LightweightDispatcher.processMouseEvent(Container.java:4559)
at java.desktop/java.awt.LightweightDispatcher.dispatchEvent(Container.java:4500)
at java.desktop/java.awt.Container.dispatchEventImpl(Container.java:2304)
at java.desktop/java.awt.Window.dispatchEventImpl(Window.java:2671)
at java.desktop/java.awt.Component.dispatchEvent(Component.java:4790)
at java.desktop/java.awt.EventQueue.dispatchEventImpl(EventQueue.java:725)
at java.desktop/java.awt.EventQueue.dispatchEvent(EventQueue.java:702)
at java.desktop/java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:203)
at java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:124)
at java.desktop/java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:113)
at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:109)
at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
at java.desktop/java.awt.EventDispatchThread.run(EventDispatchThread.java:90)
```

Note: In other apps I have working audio, e.g., in Chrome, installed Spotify app, installed Imperium Galactica GOG version, etc.