lol. well, i don't recognize that command. 
The instructions I used are here: Fingerprint Login Ubuntu MATE
I honestly expected it to fail, it's an onboard fingerprint reader not a USB, but It didn't. It even allowed me to scan my fingerprint, accepted and rejected various finger positions as one would expect from a functional fingerprint scan.
So..it's clearly IN There. But I can't figure out how to use it, not to log into the computer as I'd hoped, or any other way. it's odd.