Jupyter lab auto start or restart ( crash or server stopped ) on nvidia jetson nano or ubuntu.

jupyter-lab.service-systemd

# create a file and (name your wish) , then add this content to the file.
# OR 
# sudo vim /etc/systemd/system/jupyter-lab.service
# paste code below
# Esc , shift z z

[Unit]
Description=Start Jupyter Lab Server at Boot

[Service]
Type=simple
ExecStart=/home/$USER/<python_env>/bin/jupyter lab --allow-root  --no-browser --config=/home/$USER/.jupyter/jupyter_notebook_config.py
WorkingDirectory=$HOME
Restart=always
RestartSec=10

# sudo systemctl enable jupyter-lab.service
# sudo systemctl start jupyter-lab.service

[Install]
WantedBy=multi-user.target