Git Extensions not starting on Ubuntu 16.04

[Glenn Burkhardt]

Ubuntu 16.04.4
mono --version
Mono JIT compiler version 5.10.1.20 (tarball Thu Mar 29 10:44:58 UTC 2018)
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
        Interpreter:   yes
        LLVM:          supported, not enabled.
        GC:            sgen (concurrent by default)
GitExtensions-2.50.02-Mono.zip

glenn.burkhardt@armis-00:~/GitExtensions$ mono GitExtensions.exe

Unhandled Exception:
System.IO.FileNotFoundException: Could not load file or assembly 'System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' or one of its dependencies.
File name: 'System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'
[ERROR] FATAL UNHANDLED EXCEPTION: System.IO.FileNotFoundException: Could not load file or assembly 'System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' or one of its dependencies.
File name: 'System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'

This should be easy, right? 

I am trying to use it as an X11 client using MobaXterm to access the server.  (version 10.5).

Please help.  Thanks.

[RussKie]

https://www.google.com.au/search?q=mono+Could+not+load+assembly+System.Windows.Forms

[Glenn Burkhardt]

I had tried that search earlier, but came up short.  In any case, the answer that worked for me was

   

     sudo apt-get install mono-complete