原因之一
在安装 Jupyter notebook 时，加入了 –user
python -m pip install jupyter --user 解决方案
卸载 Jupyter notebook
python -m pip uninstall jupyter notebook 安装 Jupyter notebook
python -m pip install jupyter notebook 参考
jetbrains - "Jupyter package is not installed" if jupyter is installed for system interpreter with --user option https://youtrack.jetbrains.com/issue/PY-38761?_ga=2...-. jetbrains - "Jupyter package is not installed" using system Python 3.8 and yes, it is installed https://intellij-support.jetbrains.com/hc/en-us/community/posts/9--Jupyter-package-is-not-installed-using-system-Python-3-8-and-yes-it-is-installed stackoverflow - Running Jupyter via command line on Windows https://stackoverflow.com/questions//running-jupyter-via-command-line-on-windows 
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