Sage Kernel for Jupyter Notebooks

[Luis Finotti]

I've always installed the sagemath kernel following the guide: https://doc.sagemath.org/html/en/installation/launching.html#setting-up-sagemath-as-a-jupyter-kernel-in-an-existing-jupyter-notebook-or-jupyterlab-installation

But in my install of 10.8, the kenel does not seem to be available, at least in the "usual" location:

$ ls ~/src/sage-10.8/venv/share/jupyter/kernels/
python3/

Did it change locations?

[Dima Pasechnik]

It's likely in ~/.local/share/jupyter/kernels/sagemath/

 

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[Luis Finotti]

Here is what I have (including links I've manually created for previous versions):

$ ls ~/.local/share/jupyter/kernels/
julia-1.8/  python3/    sage-10.1@  sage-10.3@  sage-10.5@
magma/      sage-10.0@  sage-10.2@  sage-10.4@  sagemath/

Indeed, the sagemath folder contains the new 10-8 kernel.  What will happen when a new version of sage is installed?  Will it be overwritten?  I usually keep a couple of old versions for safety.  (It seems strange to write directly to an external folder.)

Also, although I can start Jupyter Lab from sage (with "sage -n jupyterlab"), when I try to use Sage from an environment containing JupyterLab, it fails to properly load the kernel:

I 2026-03-01 18:52:01.494 ServerApp] Kernel started: 2fb74636-90a0-435b-b5b5-a2e591f9f55b
/home/finotti/.venvs/DS/bin/python3: Error while finding module specification for 'sage.repl.ipython_kernel' (ModuleNotFoundError: No module named 'sage')
[I 2026-03-01 18:52:04.478 ServerApp] AsyncIOLoopKernelRestarter: restarting kernel (1/5), new random ports
/home/finotti/.venvs/DS/bin/python3: Error while finding module specification for 'sage.repl.ipython_kernel' (ModuleNotFoundError: No module named 'sage')
[I 2026-03-01 18:52:07.492 ServerApp] AsyncIOLoopKernelRestarter: restarting kernel (2/5), new random ports
/home/finotti/.venvs/DS/bin/python3: Error while finding module specification for 'sage.repl.ipython_kernel' (ModuleNotFoundError: No module named 'sage')
[I 2026-03-01 18:52:10.507 ServerApp] AsyncIOLoopKernelRestarter: restarting kernel (3/5), new random ports
/home/finotti/.venvs/DS/bin/python3: Error while finding module specification for 'sage.repl.ipython_kernel' (ModuleNotFoundError: No module named 'sage')
[I 2026-03-01 18:52:13.521 ServerApp] AsyncIOLoopKernelRestarter: restarting kernel (4/5), new random ports
/home/finotti/.venvs/DS/bin/python3: Error while finding module specification for 'sage.repl.ipython_kernel' (ModuleNotFoundError: No module named 'sage')
[I 2026-03-01 18:52:16.535 ServerApp] AsyncIOLoopKernelRestarter: restarting kernel (5/5), new random ports
/home/finotti/.venvs/DS/bin/python3: Error while finding module specification for 'sage.repl.ipython_kernel' (ModuleNotFoundError: No module named 'sage')
[W 2026-03-01 18:52:19.548 ServerApp] AsyncIOLoopKernelRestarter: restart failed
[W 2026-03-01 18:52:19.549 ServerApp] Kernel 2fb74636-90a0-435b-b5b5-a2e591f9f55b died, removing from map.

(And ipython is installed in the environment: ipython==9.10.0, ipykernel==7.2.0)