Why is Jupyter looking for extensions I haven't installed?

Question

Even in a completely pristine virtual environment I get errors of the following form

Package jupyter_server_terminals took 0.0020s to import
[W 2023-09-14 09:17:01.917 ServerApp] NAME | error adding extension (enabled: True): The module 'NAME' could not be found (No module named 'NAME'). Are you sure the extension is installed?
    Traceback (most recent call last):
      File "/Users/Rax/Documents/Projects/Coding/Python/venvs/automata/lib/python3.11/site-packages/jupyter_server/extension/manager.py", line 319, in add_extension
        extpkg = ExtensionPackage(name=extension_name, enabled=enabled)
                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/Users/Rax/Documents/Projects/Coding/Python/venvs/automata/lib/python3.11/site-packages/jupyter_server/extension/manager.py", line 183, in __init__
        self._load_metadata()
      File "/Users/Rax/Documents/Projects/Coding/Python/venvs/automata/lib/python3.11/site-packages/jupyter_server/extension/manager.py", line 198, in _load_metadata
        raise ExtensionModuleNotFound(msg) from None
    jupyter_server.extension.utils.ExtensionModuleNotFound: The module ’NAME' could not be found (No module named ’NAME'). Are you sure the extension is installed?

for

• jupyter_server_fileid
• jupyter_server_mathjax
• jupyter_server_ydoc
• jupyterlab_git
• nbclassic
• nbdime

My requirements include none of these packages, and none are installed, all I have is

notebook >=7.0   

Why is Jupyter looking for these extensions in the first place? How do I prevent these warnings?

Answer 1

Using

jupyter server extension list --debug

will show what configuration files are responsible for installing extensions and deleting any of these that are responsible for extensions you do not want will likely address the issue.