Bug Report: Xamarin Forms NuGet conflict

I've just reinstalled Visual Studio to confirm this bug, which took several hours.

Create a new Android app (single page).

In Package Manager Console, type

install-package Xamarin.Forms

This generates the following error:

install-package : NU1107: Version conflict detected for Xamarin.Android.Support.Compat. Reference the package directly from the 
project to resolve this issue. 
 App5 -> Xamarin.Android.Support.Design 27.0.2 -> Xamarin.Android.Support.Compat (= 27.0.2) 
 App5 -> Xamarin.Forms 3.0.0.482510 -> Xamarin.Android.Support.v4 25.4.0.2 -> Xamarin.Android.Support.Compat (= 25.4.0.2).
At line:1 char:1
+ install-package Xamarin.Forms
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (:) [Install-Package], Exception
    + FullyQualifiedErrorId : NuGetCmdletUnhandledException,NuGet.PackageManagement.PowerShellCmdlets.InstallPackageCommand

install-package : Package restore failed. Rolling back package changes for 'App5'.
At line:1 char:1
+ install-package Xamarin.Forms
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (:) [Install-Package], Exception
    + FullyQualifiedErrorId : NuGetCmdletUnhandledException,NuGet.PackageManagement.PowerShellCmdlets.InstallPackageCommand

I am completely blocked by this.