No package metadata was found for notebook

The issue was that I needed jlpm, which is found in jupyterlab.SlackBuild. Installing it and its dependency jupyterlab_serve.SlackBuild fixed the problem. This says:

The jlpm command is JupyterLab’s pinned version of yarn that is installed with JupyterLab. You may use yarn or npm in lieu of jlpm

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