Problems running SageMath 9.2 in JupyterLab

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I installed SageMath 9.2 by following the instructions from https://doc.sagemath.org/html/en/inst... and it works fine in terminal and Jupyter notebook, but it doesn't work in JupyterLab:

(base) paul@extra:~$ conda activate sage
(sage) paul@extra:~$ sage --notebook=jupyterlab
Jupyterlab is not installed (at least not in this Sage installation).
You can install it by running
  sage -i jupyterlab_widgets
which includes support for interacts and the ability to download and
install other Jupyterlab extensions. For a minimal installation, run
  sage -i jupyterlab
(sage) paul@extra:~$ sage -i jupyterlab
make: *** No rule to make target 'all-toolchain'.  Stop.

BTW, JupyterLab is installed and works fine. Do I need additional configuration steps?