NuGet add reference error while installing packages

Question

I am not able to install any package by Nuget. For example when I want install entity framework I receive following error:

install-package EntityFramework
Su         


        

Answer 1

When I went to Visual Studio 2015 Update 3, it broke for me, I tried many of the steps, in other answers to clear package folders / caches / etc.

In the end I got it working via:

• Full uninstall.
• Went looking for all files/locations of visual studio (AppData/Documents/etc).
• New re-install, it still didn't work (I had missed files in other locations).
• Ran devenv commands : like /resetuserdata and /resetsettings
• Ran a repair action.

So just note doing a full uninstall won't clear out all your settings/cache data.