If you are running Xaf Blazor in ubuntu 18.04 you might have seen the following exception

The type initializer for ‘Gdip’ threw an exception.
at DevExpress.ExpressApp.Actions.ActionBase.OnHandleException(Exception e) at DevExpress.ExpressApp.Actions.ActionBase.ExecuteCore(Delegate handler, ActionBaseEventArgs eventArgs) at DevExpress.ExpressApp.Actions.PopupWindowShowAction.DoExecute(Window window) at DevExpress.ExpressApp.Actions.PopupWindowShowAction.DialogController_Accepting(Object sender, DialogControllerAcceptingEventArgs e) at DevExpress.ExpressApp.SystemModule.DialogController.Accept(SimpleActionExecuteEventArgs args) at DevExpress.ExpressApp.SystemModule.DialogController.acceptAction_OnExecute(Object sender, SimpleActionExecuteEventArgs e) at DevExpress.ExpressApp.Actions.SimpleAction.RaiseExecute(ActionBaseEventArgs eventArgs) at DevExpress.ExpressApp.Actions.ActionBase.ExecuteCore(Delegate handler, ActionBaseEventArgs eventArgs)

The error is caused by missing dependency, so the DotNet runtime itself will throw that exception. Also, I want to highlight that the exception is not related to XAF, you can read more about this problem here https://github.com/dotnet/runtime/issues/27200

To get the missing dependency just open a console and run the following commands

sudo apt-get update -y

sudo apt-get install -y libgdiplus