title: Cannot install dotnet-ef tool on Windows 10
body: <p>I'm trying to install the <code>dotnet-ef</code> tool via the dotnet-cli.</p>
  
  <p>The command that I enter: <code>dotnet tool install --global dotnet-ef</code></p>
  
  <p>I gives me the following error:</p>
  
  <pre><code>The tool package could not be restored.
  Tool 'dotnet-ef' failed to install. This failure may have been caused by:
  
  * You are attempting to install a preview release and did not use the --version option to specify the version.
  * A package by this name was found, but it was not a .NET Core tool.
  * The required NuGet feed cannot be accessed, perhaps because of an Internet connection problem.
  * You mistyped the name of the tool.
  </code></pre>
  
  <p>I'm using dotnet 3.0, I believe I didn't have this problem on MacOS, I'm now trying to execute the same command on my Windows 10 machine and it gives me that error.</p>
  
  <p>Some info using <code>dotnet --info</code> command:</p>
  
  <pre><code>.NET Core SDK (reflecting any global.json):
   Version:   3.0.100
   Commit:    04339c3a26
  
  Runtime Environment:
   OS Name:     Windows
   OS Version:  10.0.18362
   OS Platform: Windows
   RID:         win10-x64
   Base Path:   C:\Program Files\dotnet\sdk\3.0.100\
  
  Host (useful for support):
    Version: 3.0.0
    Commit:  7d57652f33
  
  .NET Core SDKs installed:
    3.0.100 [C:\Program Files\dotnet\sdk]
  
  .NET Core runtimes installed:
    Microsoft.AspNetCore.All 2.1.13 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
    Microsoft.AspNetCore.App 2.1.13 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
    Microsoft.AspNetCore.App 3.0.0 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
    Microsoft.NETCore.App 2.1.13 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
    Microsoft.NETCore.App 3.0.0 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
    Microsoft.WindowsDesktop.App 3.0.0 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
  
  To install additional .NET Core runtimes or SDKs:
    https://aka.ms/dotnet-download 
  </code></pre>