/usr/share/jupyter/kernels/sagemath/kernel.json is in sagemath-jupyter 7.4-9.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 | {"display_name": "SageMath 7.4", "argv": ["/usr/bin/sage", "--python", "-m", "sage.repl.ipython_kernel", "-f", "{connection_file}"]}
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