Being a student and working every day with VSCode and .ipynb files, I was very surprised to see that, from one day to the next, the following error appeared when I tried to run a cell on one of my notebooks.
Failed to start the Kernel.
Jupyter server crashed. Unable to connect.
Error code from Jupyter: 1
After having tried the different solutions proposed by other topics, uninstall and reinstall, check that no server was working on the same address, nothing happens, the error persists.