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jupyter-notebook and bullseye

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I don't use jupyter-notebook often, so I only just discovered that I am 
encountering a problem with it following my upgrade from buster to bullseye a 
couple of months ago. It worked fine on buster, and I have changed nothing 
related to jupyter since the upgrade.

When jupyter-notebook starts the browser, I see a big red "kernel error" 
button, and when I press it, the following pops up:

----

Traceback (most recent call last):
    File "/usr/lib/python3/dist-packages/tornado/web.py", line 1704, in _execute
      result = await result
    File "/usr/lib/python3/dist-packages/tornado/gen.py", line 769, in run
      yielded = self.gen.throw(*exc_info)  # type: ignore
    File 
"/usr/lib/python3/dist-packages/notebook/services/sessions/handlers.py", line 
69, in post
      model = yield maybe_future(
    File "/usr/lib/python3/dist-packages/tornado/gen.py", line 762, in run
      value = future.result()
    File "/usr/lib/python3/dist-packages/tornado/gen.py", line 769, in run
      yielded = self.gen.throw(*exc_info)  # type: ignore
    File 
"/usr/lib/python3/dist-packages/notebook/services/sessions/sessionmanager.py", 
line 88, in create_session
      kernel_id = yield self.start_kernel_for_session(session_id, path, name, 
type, kernel_name)
    File "/usr/lib/python3/dist-packages/tornado/gen.py", line 762, in run
      value = future.result()
    File "/usr/lib/python3/dist-packages/tornado/gen.py", line 769, in run
      yielded = self.gen.throw(*exc_info)  # type: ignore
    File 
"/usr/lib/python3/dist-packages/notebook/services/sessions/sessionmanager.py", 
line 100, in start_kernel_for_session
      kernel_id = yield maybe_future(
    File "/usr/lib/python3/dist-packages/tornado/gen.py", line 762, in run
      value = future.result()
    File 
"/usr/lib/python3/dist-packages/notebook/services/kernels/kernelmanager.py", 
line 176, in start_kernel
      kernel_id = await maybe_future(self.pinned_superclass.start_kernel(self, 
**kwargs))
    File 
"/usr/lib/python3/dist-packages/jupyter_client/multikernelmanager.py", line 
185, in start_kernel
      km.start_kernel(**kwargs)
    File "/usr/lib/python3/dist-packages/jupyter_client/manager.py", line 313, 
in start_kernel
      self.kernel = self._launch_kernel(kernel_cmd, **kw)
    File "/usr/lib/python3/dist-packages/jupyter_client/manager.py", line 222, 
in _launch_kernel
      return launch_kernel(kernel_cmd, **kw)
    File "/usr/lib/python3/dist-packages/jupyter_client/launcher.py", line 
134, in launch_kernel
      proc = Popen(cmd, **kwargs)
    File "/usr/lib/python3.9/subprocess.py", line 951, in __init__
      self._execute_child(args, executable, preexec_fn, close_fds,
    File "/usr/lib/python3.9/subprocess.py", line 1823, in _execute_child
      raise child_exception_type(errno_num, err_msg, err_filename)
FileNotFoundError: [Errno 2] No such file or directory: '/usr/bin/python'

-----

It is certainly true that that file does not exist, but something is obviously 
telling jupyter to look for it. So something about the jupyter configuration 
seems to have been hosed by the upgrade.

The command "jupyter kernelspec list" produces:

----

[ZB:~] jupyter kernelspec list
-bash: /home/n7dr/.local/bin/jupyter: /usr/bin/python: bad interpreter: No 
such file or directory
[ZB:~]

----

In buster I had perhaps half a dozen kernels available (and they all worked).

Can someone suggest how I might get back to the fully-working set of kernels 
that I had in buster?

   Doc

-- 
Web:  http://enginehousebooks.com/drevans

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Thread

jupyter-notebook and bullseye "D. R. Evans" <doc.evans@gmail.com> - 2021-12-16 20:50 +0100
  Re: jupyter-notebook and bullseye Reco <recoverym4n@enotuniq.net> - 2021-12-17 14:40 +0100
    Re: jupyter-notebook and bullseye "D. R. Evans" <doc.evans@gmail.com> - 2021-12-31 21:40 +0100
      Re: jupyter-notebook and bullseye Reco <recoverym4n@enotuniq.net> - 2021-12-31 22:10 +0100
        Re: jupyter-notebook and bullseye "D. R. Evans" <doc.evans@gmail.com> - 2021-12-31 23:10 +0100
          Re: jupyter-notebook and bullseye Dan Ritter <dsr@randomstring.org> - 2021-12-31 23:40 +0100
          Re: jupyter-notebook and bullseye Nicholas Geovanis <nickgeovanis@gmail.com> - 2022-01-01 00:40 +0100
          Re: jupyter-notebook and bullseye David Wright <deblis@lionunicorn.co.uk> - 2022-01-03 04:00 +0100

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