title: Package restore failed. Rolling back package changes for "<project name>" for a brand new CORE empty project
body: <p>Using VS 2017, v15.1, Win 7, have many projects running no problem. I simply</p>
  
  <ul>
  <li><p>New, Project, Web C#, .NET Core Web App (.NET Core)</p></li>
  <li><p>ASP.NET Core 1.1 Templates</p></li>
  <li><p>F5, see "Hello World" in IE</p></li>
  <li><p>Tool, NuGet, Browse, try to add Microsoft.AspNetCore.StaticFiles, Install got "Package restore failed. Rolling back package changes".</p></li>
  </ul>
  
  <p>Maybe something is not up to date? Nuget again, it prompts me to update on AspNetCore and ApplicationInsights.AspNetCore. Okay, let's update them. Click on the Update button yielding the same message.</p>
  
  <p>This is a brand new, I haven't added any code yet. Read these, no help</p>
  
  <p><a href="https://stackoverflow.com/questions/45908613/package-restore-failed-rolling-back-package-changes-for-consoleapp1-while-ins">Console app</a>, <a href="https://stackoverflow.com/questions/46169561/package-restore-failed-rolling-back-package-changes-serilog-aspnetcore">Serilog</a>, <a href="https://stackoverflow.com/questions/45784052/package-restore-failed-rolling-back-package-changes-for-myproject-in-vs-2017">MVC Core</a></p>