Fail to install MAUI from main branch with error "Package signature validation failed"

Description

After installing the .NET 6.0 SDK, fails to install MAUI from main branch with the following error:

Workload installation failed: One or more errors occurred. (Failed to validate package signing.
Verifying Microsoft.NET.Workload.Mono.ToolChain.Manifest-6.0.300.Msi.x64.6.0.9
error: NU3004: The package is not signed.
Package signature validation failed.)

Steps to Reproduce

1. Install the .NET 6.0 SDK
2. Run open up a Windows PowerShell (run as administrator)
3. Execute the below command from the script to install the maui workload

   dotnet workload install maui `
     --from-rollback-file https://aka.ms/dotnet/maui/net6.0.json `
     --source https://pkgs.dev.azure.com/dnceng/public/_packaging/darc-pub-dotnet-runtime-6bb76b3f/nuget/v3/index.json `
     --source https://pkgs.dev.azure.com/dnceng/public/_packaging/darc-pub-dotnet-emsdk-1026ad55/nuget/v3/index.json `
     --source https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet6/nuget/v3/index.json `
     --source https://api.nuget.org/v3/index.json
   

4. The error is as shown below：

Version with bug

Unknown/Other (please specify)

Last version that worked well

Unknown/Other

Affected platforms

Windows

Affected platform versions

Windows SDK 6.0.400

Did you find any workaround?

No

Relevant log output

PS C:\Windows\system32> dotnet workload install maui `
>>   --from-rollback-file https://aka.ms/dotnet/maui/net6.0.json `
>>   --source https://pkgs.dev.azure.com/dnceng/public/_packaging/darc-pub-dotnet-runtime-6bb76b3f/nuget/v3/index.json `
>>   --source https://pkgs.dev.azure.com/dnceng/public/_packaging/darc-pub-dotnet-emsdk-1026ad55/nuget/v3/index.json `
>>   --source https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet6/nuget/v3/index.json `
>>   --source https://api.nuget.org/v3/index.json

Failed to update the advertising manifest microsoft.net.workload.mono.toolchain: Failed to validate package signing.

Verifying Microsoft.NET.Workload.Mono.ToolChain.Manifest-6.0.300.Msi.x64.6.0.9

error: NU3004: The package is not signed.

Package signature validation failed.

.
Failed to update the advertising manifest microsoft.net.workload.emscripten: Failed to validate package signing.

Verifying Microsoft.NET.Workload.Emscripten.Manifest-6.0.300.Msi.x64.6.0.8

error: NU3004: The package is not signed.

Package signature validation failed.

.
Failed to update the advertising manifest microsoft.net.sdk.tvos: Failed to extract information from MSI: C:\Users\v-xinyfe\AppData\Local\Temp\50f2fdd4-cfd1-4388-8bc0-45a143f7ad2d\data\Microsoft.NET.Sdk.tvOS.Manifest-6.0.400.15.4.447-x64.msi.
Failed to update the advertising manifest microsoft.net.sdk.macos: Failed to extract information from MSI: C:\Users\v-xinyfe\AppData\Local\Temp\0ccb676f-aff3-4f7f-a242-6a9938fbfe62\data\Microsoft.NET.Sdk.macOS.Manifest-6.0.400.12.3.447-x64.msi.
Failed to update the advertising manifest microsoft.net.sdk.maui: Failed to extract information from MSI: C:\Users\v-xinyfe\AppData\Local\Temp\0397ec39-62be-41c0-8579-ba17e09f654c\data\Microsoft.NET.Sdk.Maui.Manifest-6.0.400.6.0.507-x64.msi.
Failed to update the advertising manifest microsoft.net.sdk.maccatalyst: Failed to extract information from MSI: C:\Users\v-xinyfe\AppData\Local\Temp\4393ad24-f3d7-4fd2-a8ee-ae2fe38bb474\data\Microsoft.NET.Sdk.MacCatalyst.Manifest-6.0.400.15.4.447-x64.msi.
Failed to update the advertising manifest microsoft.net.sdk.ios: Failed to extract information from MSI: C:\Users\v-xinyfe\AppData\Local\Temp\2e727d8c-604d-4bb0-ba2a-2ce8c7a0639e\data\Microsoft.NET.Sdk.iOS.Manifest-6.0.400.15.4.447-x64.msi.
The machine has a pending reboot. Installation will continue, but you may need to restart.
Installing Microsoft.NET.Sdk.Android.Manifest-6.0.400.32.0.455-x64.msi ..... Done
Installing Microsoft.NET.Sdk.Maui.Manifest-6.0.400.6.0.507-x64.msi .... Done
Downloading microsoft.net.workload.mono.toolchain.manifest-6.0.300.msi.x64 (6.0.9)
Workload installation failed. Rolling back installed packs...
Installing Microsoft.NET.Sdk.Maui.Manifest-6.0.400.6.0.486-x64.msi .... Done
Installing Microsoft.NET.Sdk.Android.Manifest-6.0.400.32.0.448-x64.msi .... Done
Workload installation failed: One or more errors occurred. (Failed to validate package signing.

Verifying Microsoft.NET.Workload.Mono.ToolChain.Manifest-6.0.300.Msi.x64.6.0.9

error: NU3004: The package is not signed.

Package signature validation failed.

)

[jsuarezruiz]

Could you try again using the parameter “-skip-sign-check”?

[jfversluis]

Solved!