Jupyter Notebook中R内核启动失败求助：更新R与Jupyter Lab后报错

Hey there, let's get your R kernel working again in Jupyter Lab! The error you're seeing is super common after updating R via Homebrew—here's why and how to fix it:

What's Causing the Issue? #

When you updated R with Homebrew, it replaced the old 3.5.3 version with a newer one. But your Jupyter R kernel (IRkernel) is still trying to point to the old R installation path (/usr/local/Cellar/r/3.5.3/lib/R/bin/R), which no longer exists. That's exactly why you're hitting the FileNotFoundError.

Step-by-Step Fix #

1. Check your current R installation path
   Open a terminal and run this command to locate your updated R:

   which R
   

   You'll get an output like /usr/local/bin/R or /usr/local/Cellar/r/[new-version-number]/lib/R/bin/R—this is your active, working R path.

2. Reinstall and reconfigure IRkernel
   Launch R in your terminal (just type R and hit enter), then run these commands to refresh the kernel's configuration:

   # Update IRkernel to the latest version
   install.packages('IRkernel')
   # Re-register the kernel with Jupyter (use user=FALSE for global access across all users)
   IRkernel::installspec(user = FALSE)
   

   This will overwrite the old kernel settings and point Jupyter directly to your new R installation.

3. Verify the fix
   Close and restart Jupyter Lab, then try launching an R notebook again. The kernel should start up smoothly now!

Optional: Manual Cleanup (If Needed) #

If the above steps don't resolve the issue immediately, you can manually tweak the kernel config file:

• Navigate to ~/Library/Jupyter/kernels/ir on your Mac
• Open the kernel.json file
• Ensure the argv field points to the R path you found with which R
• Save the file and restart Jupyter Lab

内容的提问来源于stack exchange，提问作者Ong K.S