[BUG]: Jupyter Kernel fails to start in MAX 24.6

[oforero]

Bug description

It is not possible to run a Jupyter Notebook using MAX 24.6, it tries to start the nightly kernel and fails with the following error:

Failed to start the Kernel.
configparser.NoSectionError: No section: 'mojo-max-nightly'.
View Jupyter log for further details.

It happens at the start, hence it is not related to any code in the notebook.

It happens both when executing jupyter notebook from the magic shell, or when running it in Visual Studio Code.

Steps to reproduce

Try to run a Jupyter Notebook using the MAX kernel in MAX version 24.6

Create a mojo project, add python and jupyter. Try to run a notebook using the Max Kernel.

System information

- What OS did you do install MAX on ?

MacOS 15.2

- Provide version information for MAX by pasting the output of max -v`

That commands fails with 24.6, I get a command not found.

In magic.lock I have:

❯ cat magic.lock | grep max 
    - url: https://conda.modular.com/max/
      - conda: https://conda.modular.com/max/noarch/max-24.6.0-release.conda
      - conda: https://conda.modular.com/max/osx-arm64/max-core-24.6.0-release.conda
      - conda: https://conda.modular.com/max/osx-arm64/max-python-24.6.0-3.12release.conda
      - conda: https://conda.modular.com/max/noarch/mblack-24.6.0-release.conda
      - conda: https://conda.modular.com/max/noarch/mojo-jupyter-24.6.0-release.conda
  name: max
  url: https://conda.modular.com/max/noarch/max-24.6.0-release.conda
  - max-core ==24.6.0 release
  - max-python >=24.6.0,<25.0a0
  name: max-core
  url: https://conda.modular.com/max/osx-arm64/max-core-24.6.0-release.conda
  name: max-python
  url: https://conda.modular.com/max/osx-arm64/max-python-24.6.0-3.12release.conda
  - max-core ==24.6.0 release
  url: https://conda.modular.com/max/noarch/mblack-24.6.0-release.conda
  url: https://conda.modular.com/max/noarch/mojo-jupyter-24.6.0-release.conda
  - max-core ==24.6.0 release


- Provide version information for Mojo by pasting the output of mojo -v`

mojo 24.6.0 (4487cd6e)
python 3.12.8
jupyter 1.1.1

- Provide Magic CLI version by pasting the output of `magic -v`

The command fails, it seems not to be longer supported.

`magic info` returns:

     Magic version: 0.5.1
System
------------
      Pixi version: 0.37.0
          Platform: osx-arm64
  Virtual packages: __unix=0=0
                  : __osx=15.2=0
                  : __archspec=1=m1
         Cache dir: /Users/oscar/Library/Caches/rattler/cache
      Auth storage: /Users/oscar/.rattler/credentials.json
  Config locations: No config files found

[benz0li]

I encountered the same issue. Workaround: Modify Jupyter's kernel.json.

Cross references:

• b-data/mojo-docker-stack@b0a3026
• b-data/jupyterlab-mojo-docker-stack@bb44f09