FlubuCore dotnet cli tool not working on .Net Core 3.1

[mzorec]

It requires that .Net Core sdk 2.X is installed.

As Alternative FlubuCore global tool can be used instead.

Run dotnet flubu compile.linux
It was not possible to find any compatible framework version
The framework 'Microsoft.NETCore.App', version '2.1.0' was not found.
  - The following frameworks were found:
      3.1.1 at [/opt/hostedtoolcache/dncs/3.1.101/x64/shared/Microsoft.NETCore.App]

You can resolve the problem by installing the specified framework and/or SDK.

The specified framework can be found at:
  - https://aka.ms/dotnet-core-applaunch?framework=Microsoft.NETCore.App&framework_version=2.1.0&arch=x64&rid=ubuntu.18.04-x64

[mzorec]

It looks like this is an external issue in cli tooling. Hopefully it will get fixed. We can open an issue at microsoft if others have same issue and both alternatives are not ok

1. Install .net core 2.1 runtime or sdk.
2. Use FlubuCore local / global tool