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My problem was not understanding conda environments. I had to (re)install JupyterLab into the same environment as SageMath:

(base) paul@extra:~$ conda activate sage 
(sage) paul@extra:~$ conda install -c conda-forge jupyterlab
(sage) paul@extra:~$ sage --notebook=jupyterlab

It works now at a cost of having some redundant installations of Jupyter, but this is a typical problem with Python, I guess.