After I tried to install and register a new virtual environment so I can use it in Jupyter notebook, I ended up with the following problem: any notebook I open or create it displays the error message: "Could not find a kernel matching Python 3. Please select a kernel:"but there are no kernels registered anymore ...
I couldn't find a good answer although I noticed that many others faced the same problem in the past. Anyone could help?
I am using Ubuntu and pip.