After installing with pip install jupyter, terminal still cannot find jupyter notebook.
Ubuntu simply says command not found
To be able to run jupyter notebook from terminal, you need to make sure that ~/.local/bin is in your path.
Do this by running export PATH=$PATH:~/.local/bin for your current session, or adding that line to the end of ~/.bashrc to make your changes last for future sessions (e.g. by using nano ~/.bashrc). If you edit ~/.bashrc you will need to log out and log back in to make see your changes take effect.