我试图在Linux（Ubuntu 18.10）下用VSCode打开一个Unity3D项目。然而，Omnisharp扩展程序无法加载该项目，显示找不到程序集的错误。
这可能看起来很愚蠢，但我对.Net并不是很熟悉，而且我已经因为这个错误卡了好几天了。我已经尝试重新安装dotnet（甚至使用snap包）、mono、vscode和omnisharp扩展程序。
所以，任何帮助都是受欢迎的！:)
Unity版本：2018.3.1f1
日志：
dotnet -- info
.NET Core SDK (reflecting any global.json):
Version: 2.2.103
Commit: 8edbc2570a
Runtime Environment:
OS Name: ubuntu
OS Version: 18.10
OS Platform: Linux
RID: ubuntu.18.10-x64
Base Path: /usr/share/dotnet/sdk/2.2.103/
Host (useful for support):
Version: 2.2.1
Commit: 878dd11e62
.NET Core SDKs installed:
2.2.103 [/usr/share/dotnet/sdk]
.NET Core runtimes installed:
Microsoft.AspNetCore.All 2.2.1 [/usr/share/dotnet/shared/Microsoft.AspNetCore.All]
Microsoft.AspNetCore.App 2.2.1 [/usr/share/dotnet/shared/Microsoft.AspNetCore.App]
Microsoft.NETCore.App 2.2.1 [/usr/share/dotnet/shared/Microsoft.NETCore.App]
mono --version
（该命令用于显示Mono运行时的版本号）Mono JIT compiler version 4.6.2 (Debian 4.6.2.7+dfsg-1ubuntu1)
Copyright (C) 2002-2014 Novell, Inc, Xamarin Inc and Contributors. www.mono-project.com
TLS: __thread
SIGSEGV: altstack
Notifications: epoll
Architecture: amd64
Disabled: none
Misc: softdebug
LLVM: supported, not enabled.
GC: sgen
完整的错误日志：
Starting OmniSharp server at 1/26/2019, 7:13:55 PM
Target: /home/eyap/Projects/Unity/TestProject/TestProject.sln
OmniSharp server started.
Path: /home/eyap/.vscode/extensions/ms-vscode.csharp-1.17.1/.omnisharp/1.32.8/run
PID: 30136
[info]: OmniSharp.Stdio.Host
Starting OmniSharp on ubuntu 18.10 (x64)
[info]: OmniSharp.Services.DotNetCliService
DotNetPath set to dotnet
[info]: OmniSharp.MSBuild.Discovery.MSBuildLocator
Located 1 MSBuild instance(s)
1: StandAlone 15.0 - "/home/eyap/.vscode/extensions/ms-vscode.csharp-1.17.1/.omnisharp/1.32.8/omnisharp/msbuild/15.0/Bin"
[info]: OmniSharp.MSBuild.Discovery.MSBuildLocator
MSBUILD_EXE_PATH environment variable set to '/home/eyap/.vscode/extensions/ms-vscode.csharp-1.17.1/.omnisharp/1.32.8/omnisharp/msbuild/15.0/Bin/MSBuild.dll'
[info]: OmniSharp.MSBuild.Discovery.MSBuildLocator
Registered MSBuild instance: StandAlone 15.0 - "/home/eyap/.vscode/extensions/ms-vscode.csharp-1.17.1/.omnisharp/1.32.8/omnisharp/msbuild/15.0/Bin"
MSBuildExtensionsPath = /home/eyap/.vscode/extensions/ms-vscode.csharp-1.17.1/.omnisharp/1.32.8/omnisharp/msbuild
BypassFrameworkInstallChecks = true
CscToolPath = /home/eyap/.vscode/extensions/ms-vscode.csharp-1.17.1/.omnisharp/1.32.8/omnisharp/msbuild/15.0/Bin/Roslyn
CscToolExe = csc.exe
MSBuildToolsPath = /home/eyap/.vscode/extensions/ms-vscode.csharp-1.17.1/.omnisharp/1.32.8/omnisharp/msbuild/15.0/Bin
TargetFrameworkRootPath = /usr/lib/mono/xbuild-frameworks
[info]: OmniSharp.Cake.CakeProjectSystem
Detecting Cake files in '/home/eyap/Projects/Unity/TestProject'.
[info]: OmniSharp.Cake.CakeProjectSystem
Could not find any Cake files
[info]: OmniSharp.WorkspaceInitializer
Project system 'OmniSharp.DotNet.DotNetProjectSystem' is disabled in the configuration.
[info]: OmniSharp.MSBuild.ProjectSystem
Detecting projects in '/home/eyap/Projects/Unity/TestProject/TestProject.sln'.
[info]: OmniSharp.MSBuild.ProjectManager
Queue project update for '/home/eyap/Projects/Unity/TestProject/Assembly-CSharp.csproj'
[info]: OmniSharp.Script.ScriptProjectSystem
Detecting CSX files in '/home/eyap/Projects/Unity/TestProject'.
[info]: OmniSharp.Script.ScriptProjectSystem
Could not find any CSX files
[info]: OmniSharp.WorkspaceInitializer
Invoking Workspace Options Provider: OmniSharp.Roslyn.CSharp.Services.CSharpWorkspaceOptionsProvider
[info]: OmniSharp.WorkspaceInitializer
Configuration finished.
[info]: OmniSharp.Stdio.Host
Omnisharp server running using Stdio at location '/home/eyap/Projects/Unity/TestProject' on host 30056.
[info]: OmniSharp.MSBuild.ProjectManager
Loading project: /home/eyap/Projects/Unity/TestProject/Assembly-CSharp.csproj
[fail]: OmniSharp.MSBuild.ProjectLoader
The reference assemblies for framework ".NETFramework,Version=v4.7.1" were not found. To resolve this, install the SDK or Targeting Pack for this framework version or retarget your application to a version of the framework for which you have the SDK or Targeting Pack installed. Note that assemblies will be resolved from the Global Assembly Cache (GAC) and will be used in place of reference assemblies. Therefore your assembly may not be correctly targeted for the framework you intend.
[warn]: OmniSharp.MSBuild.ProjectManager
Failed to load project file '/home/eyap/Projects/Unity/TestProject/Assembly-CSharp.csproj'.
/home/eyap/Projects/Unity/TestProject/Assembly-CSharp.csproj
/home/eyap/.vscode/extensions/ms-vscode.csharp-1.17.1/.omnisharp/1.32.8/omnisharp/msbuild/15.0/Bin/Microsoft.Common.CurrentVersion.targets(1195,5): Error: The reference assemblies for framework ".NETFramework,Version=v4.7.1" were not found. To resolve this, install the SDK or Targeting Pack for this framework version or retarget your application to a version of the framework for which you have the SDK or Targeting Pack installed. Note that assemblies will be resolved from the Global Assembly Cache (GAC) and will be used in place of reference assemblies. Therefore your assembly may not be correctly targeted for the framework you intend.
[fail]: OmniSharp.MSBuild.ProjectManager
Attemped to update project that is not loaded: /home/eyap/Projects/Unity/TestProject/Assembly-CSharp.csproj