My full writeup for how I came to re-discovering this N-day and creating my own exploit for it can be found on my blog.
Essentially, you can git clone this repository into an attacker-controlled directory, export PYTHONPATH=<attacker_directory>, and then run main.py with that PYTHONPATH value set. Then, set up a netcat listener on 127.0.0.1:1337 and wait for a cron job or system administrator to run a sudo apt install on the system to see a root shell in your listener.