Jupyter fails to start from linux distribution

From mail list:
Hello,

I am working on Ubuntu 20.04 and using the standalone version of TVB 2.2.2 . The web application works fine but I can't launch the Jupyter interface.
It tells me:
Executing jupyter_notebook.sh
Error executing Jupyter command 'notebook': [Errno 2] No such file or directory
Done.
I did not succeded to find the cause, I wondered if it could be related to the interpreter path at the start of the jupyter-notebook script:
#!/opt/conda/envs/tvb-run/bin/python
If I try to directly launch jupyter-notebook with the same environment variables as within jupyter_notebook.sh, I get :
(...) /opt/conda/envs/tvb-run/bin/python : mauvais interpréteur: Aucun fichier
ou dossier de ce type (translation: bad interpreter, no file or directory of this type)
I would appreciate any hint !

Thank you.
Nicolas