You may need to use the recovery prompt to run the command.
Instead of choosing a different kernel under Advanced Options, choose a kernel with the (Recovery) tag.
In the recovery menu, arrowk key down to Root - Drop to Prompt
Then run
sudo apt remove --purge fprintd libpam-fprintd
Then proceed to:
Back to my desktop 
I did use the recovery command line but I misspelled fprintd...
sudo apt install install fprintd libpam-fprintd
Try enrolling fingerprint...
Same issue. I think I'll give up. This fingerprint sensor is never detected:
Thanks for your time and help @Aravisian @337harvey 
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