### Lambda Stack seems to be wiped out after Ubuntu update

This worked for me for Ubuntu 20.10

---

### Upgrade Jupyter 4.4 to latest

Thank you Leon, but my problem was not knowing that jupyter and jupyter-notebook are two separate programs.
I installed a .deb package from the following site and it solved my problem with fastai notebooks.

[Download Jupyter Notebook package](https://debian.pkgs.org/10/debian-main-amd64/jupyter-notebook_5.7.4-1_all.deb.html)