asp.net core 2.1 on arch linux does not run

Question

I have installed the latest version of the .net core using pacman on an Arch Linux:

sudo pacman -S dotnet-sdk

Running dotnet --info shows the correct version:

Host (useful for support):
  Version: 2.1.0
  Commit:  caa7b7e2ba

.NET Core SDKs installed:
  2.1.0 [/opt/dotnet/sdk]
  2.1.300 [/opt/dotnet/sdk]

I can run console applications, but when I run dotnet run in an ASP.NET Core directory return this error:

It was not possible to find any compatible framework version The specified framework 'Microsoft.AspNetCore.App', version '2.1.0' was not found.

Why though versions seem to match, it doesn't run?

More details:

ls /opt/dotnet/sdk/ returns:

2.1.300  NuGetFallbackFolder

Contents of the .csproj file:

<Project Sdk="Microsoft.NET.Sdk.Web">

  <PropertyGroup>
    <TargetFramework>netcoreapp2.1</TargetFramework>
  </PropertyGroup>

  <ItemGroup>
    <PackageReference Include="Microsoft.AspNetCore.App" />
  </ItemGroup>

</Project>

Answer 1

This question is old, but in case someone's trying to get .NET 5 to run on Arch, this can give you another solution.

If you build, publish and run the project specifying the platform runtime, dotnet will build a self-contained application, with all necessary platform specific dependencies.

You can do that with the --runtime/-r flag.

Examples for Arch:

dotnet build -r linux-x64

dotnet run -r linux-x64

dotnet publish -r linux-x64

Refer to Microsoft docs for the available runtime identifiers: https://learn.microsoft.com/en-us/dotnet/core/rid-catalog

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Edit:

I've also had less problems with paths using the AUR package instead of Snap's:

https://aur.archlinux.org/packages/dotnet-sdk-bin/

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Edit 2:

After installing AUR's aspnet-runtime-bin package, all errors about Microsoft.AspNetCore.App not being found disappeared, without using the --runtime flag:

https://aur.archlinux.org/packages/aspnet-runtime-bin

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