elpy-goto-definition is broken, asks for jedi, although elpy-config shows jedi is installed

[njheyu]

Summary

I am having trouble calling elpy-goto-definition with M-. , either prompts "Visit tags table" or complains "This feature requires the 'jedi' package to be installed, depending on whether I press M-. or call elpy-goto-definition directly, although elpy-config seems fine.

Steps to reproduce

If I press "M-." I see a prompt of "Visit tags table (default TAGS): current-folder-name"
If I call describe key "M-.", it is bounded to "xref-find-definitions", and if I type "M-x xref-find-definitions" I see the same prompt as above.
If I type "M-x elpy-goto-definition". The message complains "This feature requires the 'jedi' package to be installed. Please check 'elpy-config' for more information. However when I run elpy-config everything seems fine. And I can indeed 'import jedi' from the virtualenv I am using.

M-. used to work for me but I must have changed something and now I don't know how to make it work again.
This may be the same as the issues here
#1795
#1771

My configuration

OS

Debian 9

Result of (elpy-config)

Elpy Configuration

 

Emacs.............: 26.3

Elpy..............: 1.32.0

Virtualenv........:  (/nas/local/simscripts/hera/.nest/mi20200626/)

Interactive Python: python 3.6.10 (/nas/local/simscripts/hera/.nest/mi20200626/bin/python)

RPC virtualenv....: rpc-venv (/home/hera/.emacs.d/elpy/rpc-venv)

Python...........: /nas/local/simscripts/hera/.nest/mi20200626/bin/python 3.6.10 (/nas/local/simscripts/hera/.nest/mi20200626/bin/python)

Jedi.............: 0.17.1

Rope.............: 0.17.0

Autopep8.........: 1.5.3

Yapf.............: 0.30.0

Black............: 19.10b0

Syntax checker....: flake8 (/nas/local/simscripts/hera/.nest/mi20200626/bin/flake8)

 

Warnings

 

Options

 

`Raised' text indicates buttons; type RET or click mouse-1 on a button

to invoke its action.  Invoke [+] to expand a group, and [-] to

collapse an expanded group.  Invoke the [Group], [Face], and [Option]

buttons below to edit that item in another window.

 

[+]-- Group Elpy

[+]-- Group Python

[+]-- Group Virtual Environments (Pyvenv)

[+]-- Group Completion (Company)

[+]-- Group Call Signatures (ElDoc)

[+]-- Group Inline Errors (Flymake)

[+]-- Group Code folding (hideshow)

[+]-- Group Snippets (YASnippet)

[+]-- Group Directory Grep (rgrep)

[+]-- Group Search as You Type (ido)

[+]-- Group Django extension

[+]-- Group Autodoc extension

Elpy configuration in my init.el

(elpy-enable)
(setq elpy-rpc-python-command "/nas/local/simscripts/hera/.nest/mi20200626/bin/python")
(pyvenv-activate (expand-file-name "/nas/local/simscripts/hera/.nest/mi20200626"))

(setq python-shell-interpreter "jupyter"
            python-shell-interpreter-args "console --simple-prompt"
          python-shell-prompt-detect-failure-warning nil
 )
(add-to-list 'python-shell-completion-native-disabled-interpreters "jupyter")

(defun my-python-mode-hook ()
    (elpy-mode 1)
    (setq elpy-rpc-backend "jedi")
)
(add-hook 'python-mode-hook 'my-python-mode-hook)

[njheyu]

I did a bunch of reinstalling and upgrade and the problem magically went away.

[ckulemeyer]

@njheyu Do you remember what you reinstalled and upgraded? On my system the problem described magically appeared without changing anything