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Xamarin and Visual Studio Tools for Unity are not working together when it comes to debugging. I can't attach the debugger to Unity anymore. Xamarin works fine but somehow after installing Xamarin it breaks the Visual Studio Tools for Unity.
Here is a more detailed description of the bug, the solution works for me as well (which is deinstalling Xamarin):
And another question related to that issue:
This issue has been identified and we're working on a fix.
Fixed in Unity and in Xamarin. In Xamarin the fix is not released yet. Marking as fixed for internal QA.