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DllNotFoundException with .NET8 on Ubuntu 24.04.2 #2582

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@sky9mike

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:

   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()

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.

Activity

  1. changed the title [-]DllNotFoundException with .NET8 on Ubuntu[/-] [+]DllNotFoundException with .NET8 on Ubuntu 24.04.2[/+] on Apr 12, 2025
  2. locked and limited conversation to collaborators on Apr 14, 2025
  3. converted this issue into a discussion #2583 on Apr 14, 2025
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