VSCode jupyter kernel picker finds only one (python) of four (python, r, julia, racket) installed kernels

[BenLisowski]

Environment data

• VS Code version: v1.99.2

• Jupyter Extension version (available under the Extensions sidebar): v2025.3.0

• Python Extension version (available under the Extensions sidebar): v2025.4.0

• OS (Windows | Mac | Linux distro) and version: win 10 v10.0.19045

• Python and/or Anaconda version: python 3.12.9 / miniforge3 24.11.3-2 / conda 24.11.3

• Type of virtual environment used (N/A | venv | virtualenv | conda | ...): conda

• Jupyter server running: Local

Expected behaviour

Expect all four kernels to appear in VSCode kernel picker. Note that "jupyter kernelspec list" shows all four kernels and all four kernels are available in the kernel picker when jupyter is run in browser.

Actual behaviour

Only python 3.12.9 appears in vscode kernel picker.

Steps to reproduce:

[NOTE: Self-contained, minimal reproducing code samples are extremely helpful and will expedite addressing your issue]

Open new notebook and invoke kernel picker.

Logs

Tried running vscode jupyter log setting at "trace" level but no output appears.

Output for Jupyter in the Output panel (View→Output, change the drop-down the upper-right of the Output panel to Jupyter)

[DonJayamanne]

Please could you enable logging as follows:

• Open settings & go into Jupyter->Logging
• Change the value to trace
• Reload VS Code,
• Attempt to repro the issue & then copy the output from the Jupyter output panel (use the command Jupyter: Show Output to get to the logs).

[BenLisowski]

Here is the requested log output as I accessed the kernel picker: <details> <summary>Show Logs</summary> ``` Visual Studio Code (1.99.2, undefined, desktop)Jupyter Extension Version: 2025.3.0.Python Extension Version: 2025.4.0.Pylance Extension Version: 2025.4.1.Platform: win32 (x64).Home = c:\Users\ben48Temp Storage folder ~\AppData\Roaming\Code\User\globalStorage\ms-toolsai.jupyter\version-2025.3.0No workspace folder opened. 18:59:13.468 [debug] Start refreshing Kernel Picker (1744671553468) 18:59:13.522 [debug] Get Custom Env Variables, Class name = Rm, completed in 55ms, has a truthy return value, Arg 1: undefined, Arg 2: "RunPythonCode" 18:59:13.523 [debug] Jupyter Paths kernels: 18:59:13.535 [debug] Kernel Spec Root Paths, home\ben\.local\share\jupyter\kernels, c:\ProgramData\jupyter\kernels 18:59:13.579 [debug] End refreshing Kernel Picker (1744671553468) 18:59:14.877 [debug] Start refreshing Kernel Picker (1744671554876) 18:59:14.877 [debug] End refreshing Kernel Picker (1744671554876) 18:59:15.847 [trace] Python API env change detected, add => 'C:\Users\~\miniforge3\python.exe' 18:59:15.849 [trace] Search for KernelSpecs in Interpreter ~\miniforge3\python.exe 18:59:15.849 [debug] Start refreshing Kernel Picker (1744671555849) 18:59:15.942 [trace] Hiding default KernelSpec ~\miniforge3\python.exe for interpreter ~\miniforge3\python.exe (KernelSpec file ~\miniforge3\share\jupyter\kernels\python3\kernel.json) 18:59:15.943 [debug] End refreshing Kernel Picker (1744671555849) 18:59:15.950 [debug] KernelProvider switched kernel to id = .jvsc74a57bd07b78018612bd1b3169da3b1da958fb3bfbb35df3838fe9396a7b16586bf7fa3e.c:\Users\~\miniforge3\python.exe.c:\Users\~\miniforge3\python.exe.-m#ipykernel_launcher 18:59:15.951 [debug] start the kernel, options.disableUI=true for Untitled-1.ipynb 18:59:15.956 [debug] Controller selection change completed 18:59:15.989 [info] Starting Kernel (Python Path: ~\miniforge3\python.exe, Conda, 3.12.9) for 'Untitled-1.ipynb' (disableUI=true) 18:59:15.990 [trace] Creating raw notebook for resource 'Untitled-1.ipynb' 18:59:16.091 [trace] Conda file is C:\Users\~\miniforge3\Scripts\conda.exe 18:59:16.109 [debug] Launching kernel .jvsc74a57bd07b78018612bd1b3169da3b1da958fb3bfbb35df3838fe9396a7b16586bf7fa3e.c:\Users\~\miniforge3\python.exe.c:\Users\~\miniforge3\python.exe.-m#ipykernel_launcher for Untitled-1.ipynb in ~\AppData\Local\Programs\Microsoft VS Code with ports 9001, 9000, 9004, 9002, 9003 18:59:18.434 [debug] Get Custom Env Variables, Class name = Rm, completed in 5ms, has a truthy return value, Arg 1: undefined, Arg 2: "RunPythonCode" 18:59:18.434 [debug] Get Custom Env Variables, Class name = Rm, completed in 5ms, has a truthy return value, Arg 1: "Untitled-1.ipynb", Arg 2: "RunPythonCode" 18:59:20.511 [debug] Interpreter for Pylance for Notebook URI "Untitled-1.ipynb" is ~\miniforge3\python.exe 18:59:22.525 [debug] Got env vars from Python Ext in 4095ms for ~\miniforge3\python.exe, with env var count 75. 18:59:22.525 [trace] Prepend PATH with python bin for ~\miniforge3\python.exe 18:59:22.525 [debug] Getting activated env variables, Class name = Pd, completed in 4096ms, has a truthy return value, Arg 1: undefined, Arg 2: "~\\miniforge3\\python.exe", Arg 3: undefined 18:59:22.536 [info] Process Execution: ~\miniforge3\python.exe -m pip list 18:59:22.561 [debug] Got env vars from Python Ext in 4132ms for ~\miniforge3\python.exe, with env var count 75. 18:59:22.561 [trace] Prepend PATH with python bin for ~\miniforge3\python.exe 18:59:22.562 [debug] Getting activated env variables, Class name = Pd, completed in 4133ms, has a truthy return value, Arg 1: "Untitled-1.ipynb", Arg 2: "~\\miniforge3\\python.exe", Arg 3: undefined 18:59:22.571 [info] Process Execution: ~\miniforge3\python.exe -c "import ipykernel; print(ipykernel.__version__); print("5dc3a68c-e34e-4080-9c3e-2a532b2ccb4d"); print(ipykernel.__file__)" 18:59:22.583 [info] Process Execution: ~\miniforge3\python.exe c:\Users\~\.vscode\extensions\ms-toolsai.jupyter-2025.3.0-win32-x64\pythonFiles\vscode_datascience_helpers\kernel_interrupt_daemon.py --ppid 14584    > cwd: ~\.vscode\extensions\ms-toolsai.jupyter-2025.3.0-win32-x64\pythonFiles\vscode_datascience_helpers 18:59:22.975 [trace] Got a response of 1844 for INITIALIZE_INTERRUPT:0 18:59:22.988 [info] Process Execution: ~\miniforge3\python.exe -m ipykernel_launcher --f=c:\Users\~\AppData\Roaming\jupyter\runtime\kernel-v3ff4b2bbfd3a0bba76991f6f4db421a5a98b6e1cc.json    > cwd: ~\AppData\Local\Programs\Microsoft VS Code 18:59:22.988 [debug] Kernel process 7920. 18:59:23.398 [trace] Registering commtarget jupyter.widget 18:59:23.411 [debug] Start refreshing Interpreter Kernel Picker 18:59:23.411 [debug] Start refreshing Kernel Picker (1744671563411) 18:59:23.985 [debug] Refreshed Environments 18:59:24.478 [trace] ipykernel version & path 6.29.5, ~\miniforge3\Lib\site-packages\ipykernel\__init__.py for ~\miniforge3\python.exe 18:59:25.364 [debug] End refreshing Kernel Picker (1744671563411) 18:59:26.655 [debug] Kernel output 7920: To connect another client to this kernel, use:--existing c:\Users\~\AppData\Roaming\jupyter\runtime\kernel-v3ff4b2bbfd3a0bba76991f6f4db421a5a98b6e1cc.json 18:59:26.889 [debug] Waiting for Raw Session to be ready in postStartRawSession 18:59:26.889 [debug] Waiting for Raw session to be ready, status: connected 18:59:26.890 [trace] Raw session connected 18:59:26.890 [debug] Waited for Raw session to be ready & got status: connected 18:59:26.890 [debug] Successfully waited for Raw Session to be ready in postStartRawSession 18:59:26.890 [debug] Kernel status is 'unknown' before requesting kernel info and after ready 18:59:26.891 [debug] Sending request for kernelInfo 18:59:27.213 [trace] Got response for requestKernelInfo 18:59:27.213 [debug] Successfully completed postStartRawSession after 1 attempt(s) in 322ms 18:59:27.217 [trace] Executing silently Code (busy) = import sys as _VSCODE_sys\nprint(_VSCODE_sys.executable); del _VSCODE_sys 18:59:27.229 [trace] Executing silently Code (completed) = import sys as _VSCODE_sys\nprint(_VSCODE_sys.executable); del _VSCODE_sys with 1 output(s) 18:59:27.230 [trace] Started running kernel initialization for Untitled-1.ipynb 18:59:27.231 [trace] Executing silently Code (idle) = try:\nimport ipywidgets as _VSCODE_ipywidgets\nprint("e976ee50-99ed-4aba-9b6b-9dcd5634d07d:IPy 18:59:27.408 [trace] Executing silently Code (completed) = try:\nimport ipywidgets as _VSCODE_ipywidgets\nprint("e976ee50-99ed-4aba-9b6b-9dcd5634d07d:IPy with 1 output(s) 18:59:27.408 [trace] Determined IPyWidgets Version as 8 18:59:27.409 [trace] Version of IPyWidgets 8 determined after 3.999s 18:59:27.409 [trace] Version of IPyWidgets 8 determined after 1.992s 18:59:27.410 [trace] Executing silently Code (idle) = def __VSCODE_inject_module():\ndef __VSCODE_call_function(function, callback, data=None): 18:59:27.442 [trace] Executing silently Code (completed) = def __VSCODE_inject_module():\ndef __VSCODE_call_function(function, callback, data=None): with 0 output(s) 18:59:27.443 [debug] Requesting Kernel info 18:59:27.443 [trace] Got Kernel info 18:59:27.443 [trace] End running kernel initialization, now waiting for idle 18:59:27.444 [trace] Waiting for idle on (kernel): ef6768f1-4939-40ff-b2ca-a3ec5e09cee6 -> idle 18:59:27.444 [trace] Finished waiting for idle on (kernel): ef6768f1-4939-40ff-b2ca-a3ec5e09cee6 -> idle 18:59:27.444 [trace] End running kernel initialization, session is idle 18:59:27.446 [trace] Registering Kernel Completion Provider from kernel base (Python 3.12.9) for language python 18:59:27.448 [trace] IPyWidgetScriptSource.initialize 18:59:27.449 [info] Kernel successfully started 18:59:27.453 [debug] getDataDirsImpl, Class name = Lr (started execution), Arg 1: "Untitled-1.ipynb", Arg 2: "~\\miniforge3\\python.exe" 18:59:27.456 [debug] Get Custom Env Variables, Class name = Rm, completed in 2ms, has a truthy return value, Arg 1: undefined, Arg 2: "RunPythonCode" 18:59:27.457 [debug] Jupyter Paths : 18:59:27.468 [info] Process Execution: ~\miniforge3\python.exe c:\Users\~\.vscode\extensions\ms-toolsai.jupyter-2025.3.0-win32-x64\pythonFiles\printJupyterDataDir.py 18:59:27.579 [debug] getDataDirsImpl, Class name = Lr, completed in 125ms, has a truthy return value, Arg 1: "Untitled-1.ipynb", Arg 2: "~\\miniforge3\\python.exe", Return Value: <Uri:/C:/Users/~/AppData/Roaming/Python/share/jupyter>, <Uri:/C:/Users/~/AppData/Roaming/jupyter>, <Uri:/C:/Users/~/miniforge3/share/jupyter>, <Uri:/C:/ProgramData/jupyter> 18:59:27.960 [trace] Web view is ready to receive widget messages 18:59:27.985 [trace] Widget Message: Received IPyWidgets_kernelOptions in ScriptManager 18:59:27.985 [trace] Widget Message: Received IPyWidgetMessages.IPyWidgets_kernelOptions 18:59:28.014 [trace] Widget Message: data-base-url set to https://file%2B.vscode-resource.vscode-cdn.net/c%3A/Users/~/.vscode/extensions/ms-toolsai.jupyter-2025.3.0-win32-x64/temp/scripts/3c8c7d7644f92ef47726c1c9b2ee100294a93d4f0328c00ebaec997c49df5efe/jupyter 18:59:28.014 [trace] Widget Message: Received IPyWidgets_kernelOptions in ScriptManager 18:59:28.014 [trace] Widget Message: Received IPyWidgetMessages.IPyWidgets_kernelOptions 18:59:28.015 [trace] Widget Message: data-base-url set to https://file%2B.vscode-resource.vscode-cdn.net/c%3A/Users/~/.vscode/extensions/ms-toolsai.jupyter-2025.3.0-win32-x64/temp/scripts/3c8c7d7644f92ef47726c1c9b2ee100294a93d4f0328c00ebaec997c49df5efe/jupyter 18:59:28.549 [error] Widget Error: Failed to access CDN https://unpkg.com/ after 0 attempt(s), TypeError: Failed to fetch ``` </details> On Monday, April 14, 2025 at 04:05:46 PM EDT, Don Jayamanne ***@***.***> wrote: Please could you enable logging as follows: - Open settings & go into Jupyter->Logging - Change the value to trace - Reload VS Code, - Attempt to repro the issue & then copy the output from the Jupyter output panel (use the command Jupyter: Show Output to get to the logs). — Reply to this email directly, view it on GitHub, or unsubscribe. You are receiving this because you authored the thread.Message ID: ***@***.***> DonJayamanne left a comment (microsoft/vscode-jupyter#16549) Please could you enable logging as follows: - Open settings & go into Jupyter->Logging - Change the value to trace - Reload VS Code, - Attempt to repro the issue & then copy the output from the Jupyter output panel (use the command Jupyter: Show Output to get to the logs). — Reply to this email directly, view it on GitHub, or unsubscribe. You are receiving this because you authored the thread.Message ID: ***@***.***>

[BenLisowski]

Here is additional configuration data: jupyter kernelspec list Available kernels:   ir           C:\Users\ben48\AppData\Roaming\jupyter\kernels\ir   julia-1.8    C:\Users\ben48\AppData\Roaming\jupyter\kernels\julia-1.8   racket       C:\Users\ben48\AppData\Roaming\jupyter\kernels\racket   python3      C:\Users\ben48\AppData\Roaming\Python\share\jupyter\kernels\python3 Please could you enable logging as follows: - Open settings & go into Jupyter->Logging - Change the value to trace - Reload VS Code, - Attempt to repro the issue & then copy the output from the Jupyter output panel (use the command Jupyter: Show Output to get to the logs). — Reply to this email directly, view it on GitHub, or unsubscribe. You are receiving this because you authored the thread.Message ID: ***@***.***> Message ID: ***@***.***>

[DonJayamanne]

ms-toolsai-jupyter-insiders.vsix.zip

Please could you

• Download the attached file
• Extract this file
• Open VS Code and select the command Install from VSIX
• Select the above extracted VSIX
• When prompted to reload VS Code, please do so
• Try to replicate the issue once again
• Share the logs

[BenLisowski]

I tried twice and both times received the following error: "Unable to install extension 'ms-toolsai.jupyter' as it is not compatible with VS Code '1.99.2'." On Monday, April 14, 2025 at 10:30:25 PM EDT, Don Jayamanne ***@***.***> wrote: ms-toolsai-jupyter-insiders.vsix.zip Please could you - Download the attached file - Extract this file - Open VS Code and select the command Install from VSIX - Select the above extracted VSIX - When prompted to reload VS Code, please do so - Try to replicate the issue once again - Share the logs — Reply to this email directly, view it on GitHub, or unsubscribe. You are receiving this because you authored the thread.Message ID: ***@***.***> DonJayamanne left a comment (microsoft/vscode-jupyter#16549) ms-toolsai-jupyter-insiders.vsix.zip Please could you - Download the attached file - Extract this file - Open VS Code and select the command Install from VSIX - Select the above extracted VSIX - When prompted to reload VS Code, please do so - Try to replicate the issue once again - Share the logs — Reply to this email directly, view it on GitHub, or unsubscribe. You are receiving this because you authored the thread.Message ID: ***@***.***>

[notuntoward]

Maybe the kernel problem isn't specific to jupyter notebooks. After an hour of trying, I can't get vscode to find my .venv folder when using notebooks. But I and others have the same problem with plain python files: #24971