I don't remember the details, but rather than go through the tedious repair/uninstall process with VS 2015, I thought I'd try to install the VS 2017 Community Beta. I selected the standard template for Xamarin and then got this:
Error CS0012 The type 'Object' is defined in an assembly that is not referenced. You must add a reference to assembly 'mscorlib, Version=18.104.22.168, Culture=neutral, PublicKeyToken=7cec85d7bea7798e'. DemoXamarinForms.Droid C:\repos\DemoCode\DemoXamarinForms\DemoXamarinForms\DemoXamarinForms.Droid\MainActivity.cs 7 Active
Does anyone do any testing at Microsoft anymore? It seems that since they went to this "open source" model, all they do is post s**t with the attitude "Well, this ought to work. If it doesn't the users will let us know ..."
As DJT might tweet: "SO SAD"...