Jupyter notebook process freezes on startup

Question

I'm using Jupyter on several platforms, but for some reason, I can no longer get it to start on Windows 10.

Starting jupyter notebook with the --debug flag, returns the following information:

The output freezes at that point, no browser is started and tried to open http://localhost:8888 returns no response. The process also does not react to CTRL-C, it has to be killed.

I've tried the following:

• regenerated (overwritten) the config file with the default settings.
• completely re-installed Python and jupyter libraries.
• tried starting jupyter notebook, jupyter lab and jupyter-notebook.

Looking at the process list, I can see jupyter-notebook.exe and associated process are started.

I can also see that the child python.exe process is listening on port 8888.

The output for jupyter troubleshoot is available here (too exhaustive to paste).

Answer 1

我将输出与工作环境进行了比较，发现在冻结之后，jupyter通常会加载扩展。所以我执行了以下命令：

jupyter nbextension list

返回：

Known nbextensions:
  config dir: c:\dev\venv\jupyter\etc\jupyter\nbconfig
    notebook section
      jupyter-js-widgets/extension enabled
      - Validating: ok

然后我尝试使用jupyter nbextension disable jupyter-js-widgets禁用扩展名。

再次运行jupyter nbextension list现在会产生以下输出：

Known nbextensions:
  config dir: C:\Users\Admin\.jupyter\nbconfig
    notebook section
      jupyter-js-widgets disabled
  config dir: c:\dev\venv\jupyter\etc\jupyter\nbconfig
    notebook section
      jupyter-js-widgets/extension enabled
      - Validating: ok

Jupyter笔记本现在可以再次使用，但是我还不知道必须禁用扩展会带来什么影响，或者为什么它肯定会成为问题。