linux-packaging-mono/external/linker/global.json

{
  "tools": {
    "dotnet": "3.0.101",
    "runtimes": {
      "dotnet": [
        "3.0.0"
      ]
    }
  },
  "msbuild-sdks": {
    "Microsoft.DotNet.Arcade.Sdk": "5.0.0-beta.20109.1",
    "Microsoft.NET.Sdk.IL": "3.0.0-preview4-27520-71"
  }
}