Can t install nuget package because of Failed to initialize the PowerShell host

Question

All of a sudden  I am getting this error when upgrading Nuget packages   None of the fixes that I have come across work   I am using Visual Studio 2013       Newtonsoft Json 6 0 3  already installed       Adding  Newtonsoft Json 6 0 3  to Tournaments Notifications       Successfully added  Newtonsoft Json 6 0 3  to Tournaments Notifications       Executing script file  F  My Webs BasketballTournaments MainBranch packages Newtonsoft Json 6 0 3 tools install ps1        Failed to initialize the PowerShell host  If your PowerShell execution policy setting is set to AllSigned  open the Package Manager Console to initialize the host first    Package Manager Console     Attempting to perform the InitializeDefaultDrives operation on the  FileSystem  provider failed    If I wait for the initialization to finish in the console I was able to add some packages

User · Answer

By default the PowerShell script execution is very limited for security reasons. For use within NuGet we need to open the doors.

1. Step

Open Windows PowerShell, run as Administrator

2. Step

NuGet is using the 32 bit console, so it wont be affected by changes to the 64 bit console. Run the following script to make sure you are configuring the 32 bit console.

start-job { Set-ExecutionPolicy RemoteSigned } -RunAs32 | wait-job | Receive-Job

3. Step

Restart Visual Studio

User · Answer

All I needed to do was restart Visual Studio  open the NuGet Package Manager Console  and then using the Manage NuGet Packages dialog worked

User · Answer

I had the same problem with vs2013 and changing execution policy did not fix it  The only working solution I found was uninstalling Nuget from VS and installing it again  Steps are here  https   stackoverflow com a 32619961 3853238

User · Answer

This started happening with 6 0 4 recently for me  I don t think this is a very good solution but here is what helped me  Close Visual Studio   Open a Windows PowerShell prompt as Administrator  very important  and run the  following command Set-ExecutionPolicy Bypass Open Visual Studio  open your solution and use Nuget to install JSON Net  or whatever package included it as a dependency   Once everything is working  I recommend setting the powershell execution policy back to restricted with the following command   Set-ExecutionPolicy Restricted

User · Answer

There are an awful lot of stabs in the dark here  so I ll add my own   In my case  I also got a message that there was a missing lock file  and a recommendation to run dnu restore in the package manager console  I did so  restarted VS  and everything is now working

User · Answer

This issue is not always related to the PowerShell Execution Policy  My machine is configured as  Unrestricted  for both PowerShell x64 and x86  but I still get this error message from times to times in Visual Studio 2013   When I try to open the Package Manager Console      Windows PowerShell updated your execution policy successfully  but the   setting is overridden by a policy defined at a more specific scope     Due to the override  your shell will retain its current effective   execution policy of Unrestricted  Type  Get-ExecutionPolicy -List  to   view your execution policy settings  For more information please see    Get-Help Set-ExecutionPolicy     This is not a valid error message   Rebooting Visual Studio does not always resolve the problem    Running the process as an admin never resolves the problem   Like Declan  the latest update of the Package Manager plugin fixed the issue  2 8 60723 765

User · Answer

I had this issue with my Visual Studio 2015   I uninstalled and re-installed NuGet Package Manager again  It worked for me

User · Answer

Remember to restart Visual Studio after you ve done the Set-ExecutionPolicy Unrestricted in PowerShell  x86    If that doesn t work  try Set-ExecutionPolicy RemoteSigned in PowerShell  x86  then restart Visual Studio

User · Answer

Apparently there is a Powershell bug in Windows 10 version 1511   None of the fixes listed here worked for me   or only worked temporarily   I fixed it  both in VS2013 and VS2015  by installing version 1607  It can be downloaded here  Windows 10 Anniversary Update   Nuget issue  https   github com NuGet Home issues 3352

User · Answer

Had the same problem and this solved it for me  Powershell as admin    Set-ItemProperty -Path HKLM  Software Policies Microsoft Windows PowerShell -Name ExecutionPolicy -Value ByPass

User · Answer

Running the Visual Studio as Administrator worked for me

User · Answer

For me setting the execution policy to Unrestricted did not work  I had to repair the vs2013 installation by going into Control Panel  Repairing the installation worked for me

User · Answer

Download and Install Administrative Templates for Windows PowerShell    Next   Powershell x86 from As Administrator  Run    Get-ExecutionPolicy -List    and see if you have RemoteSigned etc    1  5 different scopes  Set-ExecutionPolicy  RemoteSigned  -Scope Process -Confirm  false  2  Machine and User Policy you have to set through the Group Policy Administration Template in 2 areas    UPDATE - EDIT   Set ALL of them to   Undefined  and ONLY the LocalMachine to  Restricted     This is what fixed might after I had given my powershell more permissions not knowing that it would mess up visual studio 2013 and 2015

User · Answer

I had a similar problem  I have fixed it by turning  Windows PowerShell 2 0  feature on in  Turn Windows features on or off   Note that this feature is turned on by default  I manually turned it off few days ago   I m working on Windows 10 Pro 64bit and same problem was with Visual Studio 2015 and 2017  32bit and 64bit app

User · Answer

By default my Windows 10 64-bit only had Powershell version 1 0 enabled  I changed the control panel Programs Programs and features Turn Windows features On Off   Make sure the Windows Powershell 2 0 engine is enabled   Restart VS2015 in non-administrator mode and with all packages installed correctly

User · Answer

No answers have worked for me   All policies were correct but I have the error when installing a package     Failed to initialize the PowerShell host  If your PowerShell execution   policy setting is set to AllSigned  open the Package Manager Console   to initialize the host first    The solution   I have uninstalled the nuget package manager plugin and reinstalled it

User · Answer

Close all the visual studio instances and try again  It worked for me

User · Answer

I had the same problem after upgrading to Windows 10   This worked for me    Close Visual Studio  Run Powershell as admin Run Set-ExecutionPolicy Unrestricted Run Visual studio as admin Clean the project and add the nuget package   If it still doesn t work try editing devenv exe config  Visual Studio 2013  C  Users  lt UserName gt  AppData Local Microsoft VisualStudio 12 0  Visual Studio 2015  C  Users  lt UserName gt  AppData Local Microsoft VisualStudio 14 0  Add the following       lt dependentAssembly gt           lt assemblyIdentity name  System Management Automation  publicKeyToken  31bf3856ad364e35    gt           lt publisherPolicy apply  no    gt       lt  dependentAssembly gt       lt dependentAssembly gt         lt assemblyIdentity name  Microsoft PowerShell Commands Utility  publicKeyToken  31bf3856ad364e35    gt         lt publisherPolicy apply  no    gt       lt  dependentAssembly gt       lt dependentAssembly gt         lt assemblyIdentity name  Microsoft PowerShell ConsoleHost  publicKeyToken  31bf3856ad364e35    gt         lt publisherPolicy apply  no    gt       lt  dependentAssembly gt       lt dependentAssembly gt         lt assemblyIdentity name  Microsoft PowerShell Commands Management  publicKeyToken  31bf3856ad364e35    gt         lt publisherPolicy apply  no    gt       lt  dependentAssembly gt       lt dependentAssembly gt         lt assemblyIdentity name  Microsoft PowerShell Security  publicKeyToken  31bf3856ad364e35    gt         lt publisherPolicy apply  no    gt       lt  dependentAssembly gt       lt dependentAssembly gt         lt assemblyIdentity name  Microsoft PowerShell Commands Diagnostics  publicKeyToken  31bf3856ad364e35    gt         lt publisherPolicy apply  no    gt       lt  dependentAssembly gt

User · Answer

If none of the above helps  see if you can update Visual Studio   I Had the same issue with Visual Studio 2017 Community when I tried to install Newtonsoft Json  The ExecutionPolicy change didn t help  I tried using both PowerShell and Registry Editor    I also tried to uninstall and install NuGet   After running VS2017 setup file  it asked for update of Visual Studio  All the problems disappeared after the update

User · Answer

Set the execution policy to Bypass instead of Unrestricted or RemoteSigned  this tutorial gives fuller instructions  Also  if you are having trouble using PowerShell to change the policy then the author shows you how to change it in Regedit

User · Answer

What did the trick for me was to re-install NuGet Package Manager by using the link below   VS 2013  https   github com NuGet Home releases download 2 8 7 NuGet Tools vsix  VS 2015  https   github com NuGet Home releases download 3 1 1 NuGet Tools vsix

User · Answer

VS2015  Updated the NuGet and worked

User · Answer

My problem solved  because in this time  Net Core not supported EF 6 2 0   change project from Core and EF installed successfully

User · Answer

I updated the Nuget package manager and that fixed it for me

User · Answer

after trying all the suggested solution nothing worked on VS 2015 update 2     deleting the package folder from the solution folder and restoring it from visual studio worked for me

User · Answer

This Nuget fix worked for me   https   github com NuGet Home issues 974 issuecomment-124774650

User · Answer

What worked for me is    Set Execution policy to Unrestricted  Find-Module ISEModuleBrowserAddon   Install-Module Import-Module ISEModuleBrowserAddon Find-Module ISEScriptAnalyzerAddOn   Install-Module Import-Module ISEScriptAnalyzerAddOn Import-Module ScriptBrowser In ISE  you need Enable-ScriptBrowser   And you have Module  Script  and Analyser in your ISE   Run in Win 10 Pro  x64 Console Host 5 0 10586 122  Good Luck

User · Answer

If you use VS 2013 Update 5  you should manually install an update 2 8 7 for NuGet Packet Manager   The bug report has more details

User · Answer

I run this command on powershell  run as admin  and it solve my issue   reg delete HKEY LOCAL MACHINE SOFTWARE Policies Microsoft Windows PowerShell  v ExecutionPolicy  f

User · Answer

After trying various suggested fixes  it was finally solved by updating the NuGet Package Manager extension in Visual Studio   This is done under Tools -  Extensions And Updates  then in the Extensions and Updates dialog Updated -  Visual Studio Gallery  A restart of Visual Studio may be required

User · Answer

I have the same issue with the Manage NuGet Packages dialog  I use a work-around that may help others - running from package manager console   If I use the command line powershell commandlet install-package  all is fine   I am adverse to changing a security setting  just to make it work

User · Answer

You need to open PM console  Tools   Nuget Package Manager   Package Manager Console   it will prompt you if you want to run nuget manager as untrusted   type  A  and click enter that will resolve the issue

User · Answer

If the above answers dint work for you -   Open Run -  windows   R Open registry editor - type regedit exe Open - HKEY LOCAL MACHINE SOFTWARE Policies Microsoft Windows PowerShell In the right pane - Modify  ExecutionPolicy  and keep its  Value Data  as blank  Restart your visual studio  Now your Powershell can initialize properly

User · Answer

Setting an execution policy to RemoteSigned or Unrestricted should work  It must be changed under an administrator mode via a PowerShell console  Be aware that changes will be applied according to the bit version of the PowerShell console  so 32bit or 64 bit  So if you want to install a package in Visual Studio  32 bit version  which requires a specific policy you should change settings of the policy via PowerShell  x86    The command in PowerShell  as administrator  to set the policy to unrestricted  as noted by  Gabriel in the comments  is   start-job   Set-ExecutionPolicy Unrestricted   -RunAs32   wait-job   Receive-Job   Having set the policy to unrestricted  you will want to set the policy back to its original after the install is complete

[powershell] Can't install nuget package because of "Failed to initialize the PowerShell host"

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