[NbConvertApp] Converting notebook /usr/bin/echo to HTML
Traceback (most recent call last):
  File "/usr/bin/jupyter-nbconvert", line 11, in <module>
    load_entry_point('nbconvert==5.6.1', 'console_scripts', 'jupyter-nbconvert')()
  File "/usr/lib/python3/dist-packages/jupyter_core/application.py", line 270, in launch_instance
    return super(JupyterApp, cls).launch_instance(argv=argv, **kwargs)
  File "/usr/lib/python3/dist-packages/traitlets/config/application.py", line 664, in launch_instance
    app.start()
  File "/usr/lib/python3/dist-packages/nbconvert/nbconvertapp.py", line 340, in start
    self.convert_notebooks()
  File "/usr/lib/python3/dist-packages/nbconvert/nbconvertapp.py", line 510, in convert_notebooks
    self.convert_single_notebook(notebook_filename)
  File "/usr/lib/python3/dist-packages/nbconvert/nbconvertapp.py", line 481, in convert_single_notebook
    output, resources = self.export_single_notebook(notebook_filename, resources, input_buffer=input_buffer)
  File "/usr/lib/python3/dist-packages/nbconvert/nbconvertapp.py", line 410, in export_single_notebook
    output, resources = self.exporter.from_filename(notebook_filename, resources=resources)
  File "/usr/lib/python3/dist-packages/nbconvert/exporters/exporter.py", line 179, in from_filename
    return self.from_file(f, resources=resources, **kw)
  File "/usr/lib/python3/dist-packages/nbconvert/exporters/exporter.py", line 197, in from_file
    return self.from_notebook_node(nbformat.read(file_stream, as_version=4), resources=resources, **kw)
  File "/usr/lib/python3/dist-packages/nbformat/__init__.py", line 140, in read
    return reads(fp.read(), as_version, **kwargs)
  File "/usr/lib/python3.8/codecs.py", line 322, in decode
    (result, consumed) = self._buffer_decode(data, self.errors, final)
UnicodeDecodeError: 'utf-8' codec can't decode byte 0xe0 in position 24: invalid continuation byte