[SOLVED] MuseScore 4 won't play on Ubuntu 22.04 w/pipewire, muse-hub crashes on load.

Trying to install sounds in ms4 on Ubuntu 22.04 LTS x86_64 with KDE/Plasma5, with pipewire/jack audio.

No ability to play or make any sounds.

Your help says to install and use muse-hub. Installed and trued to execute. CRASH!

What is Avalonia and what weird and wonderful "default font family" is it expecting to find?

[SOLVED] NOTO SANS FONT FAMILY FROM UBUNTU DISTRO NEEDED TO BE INSTALLED.
1. Download "Noto-Sans.zip" from Google.
2. Unpack its own directory.
3. Install all the .ttf fonts
4. Profit!

Noto fonts are installed by default at install of the OS. I uninstalled and blocked them so apt wouldn't ever re-install them, because it extremely annoyed me to have to (painfully) scroll through literally hundreds of fonts for 1,000+ languages I will never use, every time I wanted to simply select a font in an app. This method is superior, because it only installs the needed fonts and no other useless (for me) languages.

Reading through the cascading erors, it reminds me of "For want of a nail, the shoe was lost. For want of a shoe, the horse was lost..."

tl;dr ...

2023-11-25 20:36:35.5082|FATAL|Muse.Client.Linux.App|Application has encountered a fatal exception!|System.InvalidOperationException: Default font family name can't be null or empty.
at Avalonia.Media.FontManager..ctor(IFontManagerImpl platformImpl) in //src/Avalonia.Visuals/Media/FontManager.cs:line 33
at Avalonia.Media.FontManager.get_Current() in //src/Avalonia.Visuals/Media/FontManager.cs:line 53
at Avalonia.Media.TextFormatting.TextCharacters.TryGetRunProperties(ReadOnlySlice1 text, Typeface typeface, Typeface defaultTypeface, Int32& count) in /_/src/Avalonia.Visuals/Media/TextFormatting/TextCharacters.cs:line 129
at Avalonia.Media.TextFormatting.TextCharacters.CreateShapeableRun(ReadOnlySlice1 text, TextRunProperties defaultProperties) in //src/Avalonia.Visuals/Media/TextFormatting/TextCharacters.cs:line 62
at Avalonia.Media.TextFormatting.TextCharacters.GetShapeableCharacters() in //src/Avalonia.Visuals/Media/TextFormatting/TextCharacters.cs:line 40
at Avalonia.Media.TextFormatting.TextFormatterImpl.FetchTextRuns(ITextSource textSource, Int32 firstTextSourceIndex, TextLineBreak previousLineBreak, TextLineBreak& nextLineBreak) in //src/Avalonia.Visuals/Media/TextFormatting/TextFormatterImpl.cs:line 280
at Avalonia.Media.TextFormatting.TextFormatterImpl.FormatLine(ITextSource textSource, Int32 firstTextSourceIndex, Double paragraphWidth, TextParagraphProperties paragraphProperties, TextLineBreak previousLineBreak) in //src/Avalonia.Visuals/Media/TextFormatting/TextFormatterImpl.cs:line 15
at Avalonia.Media.TextFormatting.TextLayout.UpdateLayout() in //src/Avalonia.Visuals/Media/TextFormatting/TextLayout.cs:line 223
at Avalonia.Media.TextFormatting.TextLayout..ctor(String text, Typeface typeface, Double fontSize, IBrush foreground, TextAlignment textAlignment, TextWrapping textWrapping, TextTrimming textTrimming, TextDecorationCollection textDecorations, Double maxWidth, Double maxHeight, Double lineHeight, Int32 maxLines, IReadOnlyList`1 textStyleOverrides) in //src/Avalonia.Visuals/Media/TextFormatting/TextLayout.cs:line 71
at Avalonia.Controls.TextBlock.CreateTextLayout(Size constraint, String text) in //src/Avalonia.Controls/TextBlock.cs:line 475
at Avalonia.Controls.Primitives.AccessText.CreateTextLayout(Size constraint, String text) in //src/Avalonia.Controls/Primitives/AccessText.cs:line 156
at Avalonia.Controls.TextBlock.get_TextLayout() in //src/Avalonia.Controls/TextBlock.cs:line 166
at Avalonia.Controls.TextBlock.MeasureOverride(Size availableSize) in //src/Avalonia.Controls/TextBlock.cs:line 521
at Avalonia.Layout.Layoutable.MeasureCore(Size availableSize) in //src/Avalonia.Layout/Layoutable.cs:line 559
at Avalonia.Layout.Layoutable.Measure(Size availableSize) in //src/Avalonia.Layout/Layoutable.cs:line 364
at Avalonia.Layout.LayoutHelper.MeasureChild(ILayoutable control, Size availableSize, Thickness padding) in //src/Avalonia.Layout/LayoutHelper.cs:line 46
at Avalonia.Layout.LayoutHelper.MeasureChild(ILayoutable control, Size availableSize, Thickness padding, Thickness borderThickness) in //src/Avalonia.Layout/LayoutHelper.cs:line 39
at Avalonia.Controls.Presenters.ContentPresenter.MeasureOverride(Size availableSize) in //src/Avalonia.Controls/Presenters/ContentPresenter.cs:line 366
at Avalonia.Layout.Layoutable.MeasureCore(Size availableSize) in //src/Avalonia.Layout/Layoutable.cs:line 559
at Avalonia.Layout.Layoutable.Measure(Size availableSize) in //src/Avalonia.Layout/Layoutable.cs:line 364
at Avalonia.Layout.Layoutable.MeasureOverride(Size availableSize) in //src/Avalonia.Layout/Layoutable.cs:line 625
at Avalonia.Layout.Layoutable.MeasureCore(Size availableSize) in //src/Avalonia.Layout/Layoutable.cs:line 559
at Avalonia.Layout.Layoutable.Measure(Size availableSize) in //src/Avalonia.Layout/Layoutable.cs:line 364
at Avalonia.Controls.Grid.MeasureOverride(Size constraint) in //src/Avalonia.Controls/Grid.cs:line 230
at Avalonia.Layout.Layoutable.MeasureCore(Size availableSize) in //src/Avalonia.Layout/Layoutable.cs:line 559
at Avalonia.Layout.Layoutable.Measure(Size availableSize) in //src/Avalonia.Layout/Layoutable.cs:line 364
at Avalonia.Controls.Grid.MeasureCell(Int32 cell, Boolean forceInfinityV) in //src/Avalonia.Controls/Grid.cs:line 1150
at Avalonia.Controls.Grid.MeasureCellsGroup(Int32 cellsHead, Size referenceSize, Boolean ignoreDesiredSizeU, Boolean forceInfinityV, Boolean& hasDesiredSizeUChanged) in //src/Avalonia.Controls/Grid.cs:line 1005
at Avalonia.Controls.Grid.MeasureOverride(Size constraint) in //src/Avalonia.Controls/Grid.cs:line 448
at Avalonia.Layout.Layoutable.MeasureCore(Size availableSize) in //src/Avalonia.Layout/Layoutable.cs:line 559
at Avalonia.Layout.Layoutable.Measure(Size availableSize) in //src/Avalonia.Layout/Layoutable.cs:line 364
at Avalonia.Layout.LayoutHelper.MeasureChild(ILayoutable control, Size availableSize, Thickness padding) in //src/Avalonia.Layout/LayoutHelper.cs:line 46
at Avalonia.Layout.LayoutHelper.MeasureChild(ILayoutable control, Size availableSize, Thickness padding, Thickness borderThickness) in //src/Avalonia.Layout/LayoutHelper.cs:line 39
at Avalonia.Controls.Presenters.ContentPresenter.MeasureOverride(Size availableSize) in //src/Avalonia.Controls/Presenters/ContentPresenter.cs:line 366
at Avalonia.Layout.Layoutable.MeasureCore(Size availableSize) in //src/Avalonia.Layout/Layoutable.cs:line 559
at Avalonia.Layout.Layoutable.Measure(Size availableSize) in //src/Avalonia.Layout/Layoutable.cs:line 364
at Avalonia.Layout.LayoutHelper.MeasureChild(ILayoutable control, Size availableSize, Thickness padding) in //src/Avalonia.Layout/LayoutHelper.cs:line 46
at Avalonia.Controls.Primitives.VisualLayerManager.MeasureOverride(Size availableSize) in //src/Avalonia.Controls/Primitives/VisualLayerManager.cs:line 133
at Avalonia.Layout.Layoutable.MeasureCore(Size availableSize) in //src/Avalonia.Layout/Layoutable.cs:line 559
at Avalonia.Layout.Layoutable.Measure(Size availableSize) in //src/Avalonia.Layout/Layoutable.cs:line 364
at Avalonia.Layout.Layoutable.MeasureOverride(Size availableSize) in //src/Avalonia.Layout/Layoutable.cs:line 625
at Avalonia.Layout.Layoutable.MeasureCore(Size availableSize) in //src/Avalonia.Layout/Layoutable.cs:line 559
at Avalonia.Layout.Layoutable.Measure(Size availableSize) in //src/Avalonia.Layout/Layoutable.cs:line 364
at Avalonia.Layout.Layoutable.MeasureOverride(Size availableSize) in //src/Avalonia.Layout/Layoutable.cs:line 625
at Avalonia.Controls.Window.MeasureOverride(Size availableSize) in //src/Avalonia.Controls/Window.cs:line 916
at Avalonia.Controls.WindowBase.MeasureCore(Size availableSize) in //src/Avalonia.Controls/WindowBase.cs:line 247
at Avalonia.Layout.Layoutable.Measure(Size availableSize) in //src/Avalonia.Layout/Layoutable.cs:line 364
at Avalonia.Layout.LayoutManager.Measure(ILayoutable control) in //src/Avalonia.Layout/LayoutManager.cs:line 297
at Avalonia.Layout.LayoutManager.ExecuteInitialLayoutPass() in //src/Avalonia.Layout/LayoutManager.cs:line 184
at Avalonia.Controls.Window.ShowCore(Window parent) in //src/Avalonia.Controls/Window.cs:line 693
at Avalonia.Controls.Window.Show() in //src/Avalonia.Controls/Window.cs:line 631
at Avalonia.Controls.ApplicationLifetimes.ClassicDesktopStyleApplicationLifetime.ShowMainWindow() in //src/Avalonia.Controls/ApplicationLifetimes/ClassicDesktopStyleApplicationLifetime.cs:line 129
at Avalonia.Controls.ApplicationLifetimes.ClassicDesktopStyleApplicationLifetime.Start(String[] args) in //src/Avalonia.Controls/ApplicationLifetimes/ClassicDesktopStyleApplicationLifetime.cs:line 118
at Avalonia.ClassicDesktopStyleApplicationLifetimeExtensions.StartWithClassicDesktopLifetime[T](T builder, String[] args, ShutdownMode shutdownMode) in /_/src/Avalonia.Controls/ApplicationLifetimes/ClassicDesktopStyleApplicationLifetime.cs:line 209
at Muse.Client.Linux.Program.Main(String[] args) in /home/runner/work/Muse/Muse/Linux/src/Muse.Client.Linux/Program.cs:line 21