What did you need to install to get it to run? I get this error when I try to run mono GitExtensions.exe:
Unhandled Exception: System.TypeLoadException: Could not load type 'GitUI.FormChooseTranslation' from assembly 'GitUI, Version=2.40.0.0, Culture=neutral, PublicKeyToken=null'.
[ERROR] FATAL UNHANDLED EXCEPTION: System.TypeLoadException: Could not load type 'GitUI.FormChooseTranslation' from assembly 'GitUI, Version=2.40.0.0, Culture=neutral, PublicKeyToken=null'.
Running 12.04 as well. Thanks!