fprintd-enroll
# or create a new signature for all fingers:
fprintd-delete "$USER"
for finger in {left,right}-{thumb,{index,middle,ring,little}-finger};
do fprintd-enroll -f "$finger" "$USER";
done
# You can also enroll without an authentication agent :
fprintd-enroll user
# To verify the newly created fingerprint, use :
fprintd-verify