DllNotFoundException with .NET8 on Ubuntu 24.04.2 #2583

sky9mike · 2025-04-12T23:23:46Z

sky9mike
Apr 12, 2025

I have used Python.NET from C# on Windows for years (huge thank you to all). I'm now trying get some stuff running on Linux and .NET8.

Using latest nuget for Python.NET (3.0.5) everything works great under Windows. But on Ubuntu 24.04.2 LTS I get:

$ /snap/bin/dotnet-runtime-80.dotnet PythonDotNetDotNET8Sample.dll
   Unhandled exception. System.TypeInitializationException: The type initializer for 'Delegates' threw an exception.
 ---> System.DllNotFoundException: Could not load /usr/lib/x86_64-linux-gnu/libpython3.12.so.1.0 with flags RTLD_NOW | RTLD_GLOBAL: /usr/lib/x86_64-linux-gnu/libpython3.12.so.1.0: cannot open shared object file: No such file or directory
   at Python.Runtime.Platform.PosixLoader.Load(String dllToLoad)
   at Python.Runtime.Runtime.Delegates.GetUnmanagedDll(String libraryName)
   at Python.Runtime.Runtime.Delegates..cctor()
   --- End of inner exception stack trace ---
   at Python.Runtime.Runtime.Delegates.get_Py_IsInitialized()
   at Python.Runtime.Runtime.Py_IsInitialized()
   at Python.Runtime.Runtime.<>c.<Initialize>b__32_0()
   at Python.Runtime.Runtime.TryUsingDll[T](Func`1 op)
   at Python.Runtime.Runtime.Initialize(Boolean initSigs)
   at Python.Runtime.PythonEngine.Initialize(IEnumerable`1 args, Boolean setSysArgv, Boolean initSigs)
   at Python.Runtime.PythonEngine.Initialize(Boolean setSysArgv, Boolean initSigs)
   at Python.Runtime.PythonEngine.Initialize()

.NET8 was installed via:

sudo snap install dotnet-runtime-80

Python looks OK?

$ ls -l /usr/lib/x86_64-linux-gnu/libpython3.12.so*
lrwxrwxrwx 1 root root      20 Feb  4 08:48 /usr/lib/x86_64-linux-gnu/libpython3.12.so.1 -> libpython3.12.so.1.0
-rw-r--r-- 1 root root 9055112 Feb  4 08:48 /usr/lib/x86_64-linux-gnu/libpython3.12.so.1.0

Code:

using Python.Runtime;

Console.WriteLine("Starting up ...");

Runtime.PythonDLL = "/usr/lib/x86_64-linux-gnu/libpython3.12.so.1.0";
//Runtime.PythonDLL = @"C:\Skyworks\Git\Tools3\Misc\MiniPythonDistis\PythonForCBPro312\python312.dll";

Console.WriteLine("Initializing Python.NET ...");
PythonEngine.Initialize();
Console.WriteLine("Done");

using (Py.GIL())
{
    dynamic hello = Py.Import("hello");
    hello.say_hello();
}

Full C# project:
PythonDotNetDotNET8Sample.zip

Any tips? Thank you.

sky9mike · 2025-04-14T19:55:06Z

sky9mike
Apr 14, 2025
Author

Something I excluded from my description above originally: I had installed .NET8 via snap. I was trying to emulate how I thought it might be installed for a project I am working on.

Today I installed VS Code on Ubuntu and then it installed dotnet 8 SDK. When run via "dotnet", it worked!

0 replies

RedEye-Developers · 2025-11-17T10:54:08Z

RedEye-Developers
Nov 17, 2025

fail: Microsoft.Extensions.Hosting.Internal.Host[9]
      BackgroundService failed
      System.TypeInitializationException: The type initializer for 'Delegates' threw an exception.
       ---> System.DllNotFoundException: Could not load /usr/lib/x86_64-linux-gnu/libpython3.12.so.1.0 with flags RTLD_NOW | RTLD_GLOBAL: /snap/core22/current/lib/x86_64-linux-gnu/libm.so.6: version `GLIBC_2.38' not found (required by /usr/lib/x86_64-linux-gnu/libpython3.12.so.1.0)

is this issue is solved ?

i am also stuck i this same issue, the python313.dll was loading fine in windows but if i try to load libpython3.12.so in linux machine it is throw error.

why this issue was close without answer ?

1 reply

filmor Nov 17, 2025
Maintainer

This is a different issue. Please read the error message and read my response in the other thread.

This one in particular is about not actually finding the file:

cannot open shared object file: No such file or directory

Your issue is about a libpython that is incompatible with your libc:

version `GLIBC_2.38' not found (required by /usr/lib/x86_64-linux-gnu/libpython3.12.so.1.0)

sky9mike · 2025-11-17T13:16:40Z

sky9mike
Nov 17, 2025
Author

I probably closed the issue since I found a work around for my issue. I'm not actively using Python.NET on Linux so can't be much further help, sorry.

0 replies

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DllNotFoundException with .NET8 on Ubuntu 24.04.2 #2583

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DllNotFoundException with .NET8 on Ubuntu 24.04.2 #2583

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sky9mike Apr 12, 2025

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sky9mike Apr 14, 2025 Author

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RedEye-Developers Nov 17, 2025

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filmor Nov 17, 2025 Maintainer

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sky9mike Nov 17, 2025 Author

sky9mike
Apr 12, 2025

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sky9mike
Apr 14, 2025
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RedEye-Developers
Nov 17, 2025

filmor Nov 17, 2025
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sky9mike
Nov 17, 2025
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