我已经安装并配置了jupyter notebook作为公共服务器运行（有密码）。当我运行jupyter notebook时，它告诉我fullchain.pem文件不存在。

(jupyter) rootadmin@ubuntu12:~/opensurfaces$ jupyter notebook
Traceback (most recent call last):
  File "/home/rootadmin/opensurfaces/jupyter/bin/jupyter-notebook", line 8, in <module>
    sys.exit(main())
  File "/home/rootadmin/opensurfaces/jupyter/lib/python3.6/site-packages/jupyter_core/application.py", line 270, in launch_instance
    return super(JupyterApp, cls).launch_instance(argv=argv, **kwargs)
  File "/home/rootadmin/opensurfaces/jupyter/lib/python3.6/site-packages/traitlets/config/application.py", line 663, in launch_instance
    app.initialize(argv)
  File "<decorator-gen-7>", line 2, in initialize
  File "/home/rootadmin/opensurfaces/jupyter/lib/python3.6/site-packages/traitlets/config/application.py", line 87, in catch_config_error
    return method(app, *args, **kwargs)
  File "/home/rootadmin/opensurfaces/jupyter/lib/python3.6/site-packages/notebook/notebookapp.py", line 1769, in initialize
    self.init_webapp()
  File "/home/rootadmin/opensurfaces/jupyter/lib/python3.6/site-packages/notebook/notebookapp.py", line 1485, in init_webapp
    max_buffer_size=self.max_buffer_size)
  File "/home/rootadmin/opensurfaces/jupyter/lib/python3.6/site-packages/tornado/util.py", line 286, in __new__
    instance.initialize(*args, **init_kwargs)
  File "/home/rootadmin/opensurfaces/jupyter/lib/python3.6/site-packages/tornado/httpserver.py", line 191, in initialize
    read_chunk_size=chunk_size,
  File "/home/rootadmin/opensurfaces/jupyter/lib/python3.6/site-packages/tornado/tcpserver.py", line 134, in __init__
    'certfile "%s" does not exist' % self.ssl_options["certfile"]
ValueError: certfile "/etc/letsencrypt/live/my_website_url/fullchain.pem" does not exist

在juputer_notebook_config.py文件中，我有以下内容

## The full path to an SSL/TLS certificate file.
c.NotebookApp.certfile = u'/etc/letsencrypt/live/my_website_url/fullchain.pem'

该文件存在（在该确切位置），具有以下权限

(jupyter) rootadmin@ubuntu12:/etc/letsencrypt/live/my_website_url$ ls -l
total 4
lrwxrwxrwx 1 root root       49 Mar 12 12:26 cert.pem -> ../../archive/my_website_url/cert9.pem
lrwxrwxrwx 1 root root       50 Mar 12 12:26 chain.pem -> ../../archive/my_website_url/chain9.pem
lrwxrwxrwx 1 root root       54 Mar 12 12:26 fullchain.pem -> ../../archive/my_website_url/fullchain9.pem
lrwxrwxrwx 1 root root       52 Mar 12 12:26 privkey.pem -> ../../archive/my_website_url/privkey9.pem

我不能用我的用户（例如nano fullchain.pem）读取这个文件，但是我可以用sudo nano读取它，我想我可以把文件复制到jupyter可以读取的位置，但是这看起来有点傻。
我怎样才能使jupyter笔记本工作？

• edit*：如果我确实只是简单地将证书文件复制到不同的位置，它看起来是有效的。那么我遇到了一个不同的，而且我认为是无关的问题。我提出了一个关于that problem的单独问题