title: System.PlatformNotSupportedException: 'Operation is not supported on this platform.'
body: <p>.NET core 3.0 when runtime get an System.PlatformNotSupported Exception 'Operation is not supported on this platform.'
  <a href="https://i.stack.imgur.com/t5EHW.png" rel="nofollow noreferrer">error</a></p>
  
  <p>Also im tryed on ubuntu 19.04, same exception</p>