Menu items greyed out and linting not enabled

Thanks for making this! Unfortunately I can’t get it to work, the menu items are greyed out. I have flake8 installed both in my conda env and system wide. I tried both with the base conva env current one. Logging is true in the config. I can open a terminal in JL and which flake8 shows me the path to my conda installed flake8. There are no error message in the terminal from which I run JL and I could not see anything related to flake8 in the firefox console log. I am Not sure what to try next. I installed the plugin today.

flake8              3.7.9
IPython             6.5.0
jupyter_client      5.2.3
jupyter_core        4.6.3
jupyterlab          2.1.0
notebook            5.6.0
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Python 3.7.6 | packaged by conda-forge | (default, Mar 23 2020, 23:03:20) [GCC 7.3.0]
Linux-5.6.2-arch1-2-x86_64-with-arch
4 logical CPU cores
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[nuclear0wl]

Hello, I’ve faced the same issue.

My environment is

• Docker image jupyter/pyspark-notebook:c76996e26e48 as a Notebook server
• OS X + Google Chrome browser as a client side

I can’t realize the cause of this issue but have found a way to fix it dirty and quickly. In JypyterLab you may go to Settings -> Advanced settings -> Jupyterlab-Flake8 and set "terminal_name" in User preferences to 1. After that save config, reload JupyterLab page in your browser and try to lint something in a Notebook.

Unfortunately, if you need to enable/disable linting regularly (I need it as this extension conflicts with @jupyterlab/debugger) you may again run into greyed menu items and absence of linting. In that case, you may go back to the User preferences of extension and find that "toggled" option is set to false. Set it to true and reload the browser page.

Hope, it may help somebody besides me and give contributor some ideas about the root cause of this issue.

[goekce]

If you are looking for another PEP8 linter: https://github.com/jupyter-lsp/jupyterlab-lsp