How to recover deleted iPython Notebooks

This is bit of additional info on the answer by Thuener,

I did the following to recover my deleted .ipynb file.

1. The cache is in ~/.cache/chromium/Default/Cache/ (I use chromium)
2. used grep in binary search mode, grep -a ‘import math’ (replace search string by a keyword specific in your code)
3. Edit the binary file in vim (it doesn’t open in gedit)
   • The python ipynb should file start with ‘{ “cells”:’ and
   • ends with ‘”nbformat”: 4, “nbformat_minor”: 2}’
   • remove everything outside these start and end points
4. Rename the file as .ipynb, open it in your jupyter-notebook, it works.