I opened your project in Ubuntu 20.04 MonoDevelop The project Runs and the main menu opens. But the text is invisible. Whenever a popup or alert in application appears, the text temporarily appears. I was unable to do any migration.   
I opened your project in Ubuntu 20.04 MonoDevelop
The project Runs and the main menu opens. But the text is invisible.
Whenever a popup or alert in application appears, the text temporarily appears.
I was unable to do any migration.