Default font family name can't be null or empty(ubuntu20.04)

[chenloveheimei]

(realbasicvsr1) ✘ ⚙ long@long-Ubuntu  ~/resources/soft/PixelViewer-2.7.4.312-linux-x64  ./PixelViewer
Unhandled 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, IReadOnlyList1 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.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.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 427 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 427 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.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.Border.MeasureOverride(Size availableSize) in /_/src/Avalonia.Controls/Border.cs:line 187 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.ExecuteMeasurePass() in /_/src/Avalonia.Layout/LayoutManager.cs:line 261 at Avalonia.Layout.LayoutManager.InnerLayoutPass() in /_/src/Avalonia.Layout/LayoutManager.cs:line 243 at Avalonia.Layout.LayoutManager.ExecuteLayoutPass() in /_/src/Avalonia.Layout/LayoutManager.cs:line 145 at Avalonia.Layout.LayoutManager.ExecuteQueuedLayoutPass() in /_/src/Avalonia.Layout/LayoutManager.cs:line 104 at Avalonia.Threading.JobRunner.Job.Avalonia.Threading.JobRunner.IJob.Run() in /_/src/Avalonia.Base/Threading/JobRunner.cs:line 181 at Avalonia.Threading.JobRunner.RunJobs(Nullable1 priority) in //src/Avalonia.Base/Threading/JobRunner.cs:line 37
at Avalonia.Threading.Dispatcher.RunJobs(DispatcherPriority minimumPriority) in //src/Avalonia.Base/Threading/Dispatcher.cs:line 80
at Avalonia.X11.X11Window.b__103_0() in //src/Avalonia.X11/X11Window.cs:line 512
at Avalonia.Threading.JobRunner.Job.Avalonia.Threading.JobRunner.IJob.Run() in //src/Avalonia.Base/Threading/JobRunner.cs:line 181
at Avalonia.Threading.JobRunner.RunJobs(Nullable`1 priority) in //src/Avalonia.Base/Threading/JobRunner.cs:line 37
at Avalonia.X11.X11PlatformThreading.HandleX11(CancellationToken cancellationToken) in //src/Avalonia.X11/X11PlatformThreading.cs:line 169
at Avalonia.X11.X11PlatformThreading.RunLoop(CancellationToken cancellationToken) in //src/Avalonia.X11/X11PlatformThreading.cs:line 245
at Avalonia.Threading.Dispatcher.MainLoop(CancellationToken cancellationToken) in //src/Avalonia.Base/Threading/Dispatcher.cs:line 65
at Avalonia.Controls.ApplicationLifetimes.ClassicDesktopStyleApplicationLifetime.Start(String[] args) in //src/Avalonia.Controls/ApplicationLifetimes/ClassicDesktopStyleApplicationLifetime.cs:line 120
at Avalonia.ClassicDesktopStyleApplicationLifetimeExtensions.StartWithClassicDesktopLifetime[T](T builder, String[] args, ShutdownMode shutdownMode) in /_/src/Avalonia.Controls/ApplicationLifetimes/ClassicDesktopStyleApplicationLifetime.cs:line 209
at Carina.PixelViewer.App.Main(String[] args) in /Users/carina/Studio/PixelViewer/PixelViewer/App.axaml.cs:line 72

[chenloveheimei]

已解决。
我设置成英文语言，就可以启动了。

[hamster620]

Same as #9 .