MarsSeed [1] filed a deletion request for jupyter-notebook-launcher [2]: Broken, abandoned package from 2018. Also upstream is not maintained since that year. [a]
And dependency 'jupyter' does not exist. [a]: https://github.com/gads31400/Jupyter_notebook_launcher [1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/jupyter-notebook-launcher/
