sage -n can't find jupyter sagemath kernel

Jupyter

asked 2025-09-04 01:12:45 +0100

aberent
11 ●1 ●1 ●2

I installed sage on Ubuntu (24.04) , and sage works fine in a terminal, but if I try "sage -n" Jupyter opens without a sagemath kernel. This is not surprising since I also get the message "WARNING:traitlets:Kernelspec name sagemath cannot be found!".

I have tried both building sage from source, and installing it from the appimage, and get the same results in both cases. How can I fix this?

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answered 2026-01-22 17:47:40 +0100

Matthias Steiner
63 ●2 ●5

I ran into the same problem on Linux Mint.

A workaround on my system is to launch a Python Jupyter server via sage -n, and in the first cell of a notebook I import sage via from sage.all import *.