More reliable method

Note to self mostly, as I keep forgetting which is which:
https://github.com/eliphatfs/apt-local-install
is more maintained and reliable for e.g. Google Colab permanence needs.

The issue links to eliphatfs/apt-local and mentions Google Colab permanence, but names no file, test, or entry point in this repository. First review the linked project and this repository's current documentation or package-manager entry points; done should be defined as a documented, agreed method rather than a personal note.

Written by the indexing model from the issue text.