IIISEnvironmentFeature could not be found on Ubuntu Linux

[radzawee]

I'm unable to run migrated web application on Ubuntu Linux with dotnet packages installed from Ubuntu repository (not from Microsoft).
App works fine with dotnet files downloaded manually using Microsoft script, but I prefer to use distro packages mechanism.

Exception:

System.TypeLoadException: Could not load type 'Microsoft.AspNetCore.Server.IIS.IIISEnvironmentFeature' from assembly 'Microsoft.AspNetCore.Server.IIS, Version=10.0.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60'.

Reproduction:

var builder = WebApplication.CreateBuilder(args);
builder.Services.AddSystemWebAdapters();
var app = builder.Build();
app.UseSystemWebAdapters();
await app.RunAsync();

I'm building against .NET 10.

Packages details:

$ dotnet --list-runtimes
Microsoft.AspNetCore.App 8.0.25 [/usr/lib/dotnet/shared/Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 10.0.4 [/usr/lib/dotnet/shared/Microsoft.AspNetCore.App]
Microsoft.NETCore.App 8.0.25 [/usr/lib/dotnet/shared/Microsoft.NETCore.App]
Microsoft.NETCore.App 10.0.4 [/usr/lib/dotnet/shared/Microsoft.NETCore.App]

$ dpkg -l | grep ii | grep dotnet
ii  dotnet-apphost-pack-8.0               8.0.25-0ubuntu1~24.04.1                 amd64        Internal - targeting pack for Microsoft.NETCore.App 8.0
ii  dotnet-host-10.0                      10.0.4-0ubuntu1~24.04.1                 amd64        .NET host command line
ii  dotnet-hostfxr-10.0                   10.0.4-0ubuntu1~24.04.1                 amd64        .NET host resolver
ii  dotnet-hostfxr-8.0                    8.0.25-0ubuntu1~24.04.1                 amd64        .NET host resolver
ii  dotnet-runtime-10.0                   10.0.4-0ubuntu1~24.04.1                 amd64        .NET runtime
ii  dotnet-runtime-8.0                    8.0.25-0ubuntu1~24.04.1                 amd64        .NET runtime
ii  dotnet-runtime-deps-8.0               8.0.18-1                                amd64        dotnet-runtime-deps-debian 8.0.18
ii  dotnet-targeting-pack-8.0             8.0.25-0ubuntu1~24.04.1                 amd64        Internal - targeting pack for Microsoft.NETCore.App 8.0
ii  dotnet-templates-8.0                  8.0.125-0ubuntu1~24.04.1                amd64        .NET 8.0 templates

[twsouthwick]

it appears that the ubuntu version doesn't include the IIS component that we rely on. To fix this, we'd need to only selectively load this if it is available.

App works fine with dotnet files downloaded manually using Microsoft script, but I prefer to use distro packages mechanism.

Because of this, it's probably a low priority, but I'll see if CCA can do anything, otherwise, feel free to submit a PR!