Godot: Godot找不到MSBuild

Godot版本：

919fa75803177d0dc8f03c16b6be1360140145e1单声道

操作系统/设备，包括版本：

Ubuntu 18.10

问题说明：

Godot在打开项目时因错误而崩溃：

WARNING: godot_icall_BuildInstance_get_MSBuildPath: Cannot find binary for 'MSBuild (Mono)'
   At: modules/mono/editor/godotsharp_builds.cpp:157.

Unhandled Exception:
System.IO.FileNotFoundException: Cannot find the MSBuild executable.
  at GodotSharpTools.Build.BuildInstance.GetMSBuildPath () [0x00013] in <3784b87b8dcf4df689003e241edd60cb>:0 
  at GodotSharpTools.Build.BuildInstance.Build (System.String loggerAssemblyPath, System.String loggerOutputDir, System.String[] customProperties) [0x0003d] in <3784b87b8dcf4df689003e241edd60cb>:0 

但是，已经安装了msbuild，因为我可以用它构建编辑器，并且可以从终端调用它：

Microsoft (R) Build Engine version 16.0.0.0 for Mono
Copyright (C) Microsoft Corporation. All rights reserved.

MSBUILD : error MSB1003: Specify a project or solution file. The current working directory does not contain a project or solution file.