Hello EK. The ".ipynb" extension is not meant to indicate the type of kernel to which the notebook file is associated, it's purely an indicator that this is a Jupyter notebook and is more a function of the project having been originally named IPython. Had the project been named Jupyter from the start, I imagine the extension would have been ".jnb".
I suspect your R and Julia kernels are not correctly configured since it appears the server knows about them (as they are selectable) but is encountering an error during their startup. I recommend looking at your server's console (where the Lab instance was started) since there should be some information specific to the failed start attempts. You probably have some additional dependencies missing. You will likely need to look at the `argv` stanza of the `kernel.json` file associated with your R and/or Julia kernels since that is the command that is issued to start each kernel. Lastly, if you would like to change your "default" kernel, you can configure 'MappingKernelManager.default_kernel_name=julia'. This can be done within a configuration file via 'c.MappingKernelManager.default_kernel_name=julia' or the command line via '--MappingKernelManager.default_kernel_name=julia'. Note that I'm not familiar with the Julia kernel or its default naming but am assuming its configuration resides in the directory named 'julia' - which is the target of the 'default_kernel_name' attribute I reference and where its aforementioned `kernel.json` file will reside. Note that the directories for where the `kernel.json` files reside can be found using `jupyter kernelspec list` and (for completeness) the left-hand values of that output is the string that should be referenced in the 'default_kernel_name' configuration option. Best regards, Kevin. On Monday, July 25, 2022 at 2:22:20 PM UTC-7 esa...@gmail.com wrote: > Hi all-- > > I installed Jupyterlab with python3 and kernels installed. I added Julia > kernel. Now, every time i open a new notebook, the file automatically > given ipynb extension. When i change the kernel to R, the code does not run > and the kernel on top right changes to no kernel and defaults back to > Python3. > > If i chose Julia kernel, i get this error "error starting kernel, > unhandled error" > > Any input is highly appreciated. > > EK > -- You received this message because you are subscribed to the Google Groups "Project Jupyter" group. To unsubscribe from this group and stop receiving emails from it, send an email to jupyter+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/jupyter/9be078cd-147d-49f7-97d1-94ccdff443b1n%40googlegroups.com.
