Usual Jupyter kernels not available

Hello,

I am unable to connect to the usual Python kernels I use for Jupyter notebook in JupyterLab sessions.
Usually, I can choose between several Python3 kernels (Python3.12, 3.9, etc) which all have a lot of python libraries installed.
Today I can only start a "Python 3 (ipykernel)" kernel which doesn't seem to have basic libraries such as matlpotlib or BioPython installed.
Has there been any change recently in how kernels are managed in JupyterLab ?

Thank you very much

Hello, I used the documentation in :
https://ifb-elixirfr.gitlab.io/cluster/doc/software/jupyter/
to create my own environment and add a kernel to my local folder.
I think the environment I was using previously is the one at /shared/ifbstor1/software/miniconda/envs/python-3.12/ but I don't know why its kernel disappeared from my local home directory. I reinstalled it anyway.

I hope there is no issue with what I did