fprintd-enroll: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On CentOS possible default full paths are:

/usr/bin/fprintd-enroll - from package: fprintd

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/bin/fprintd-enroll - from package: fprintd

You may install the required package with command apt-get install {package}

Error in other languages:
fprintd-enroll: bevel nie gevind nie
fprintd-enroll: comandă negăsită
fprintd-enroll: comando não encontrado
fprintd-enroll: commande introuvable
fprintd-enroll: command not found
fprintd-enroll: käsku ei ole
fprintd-enroll: không tìm thấy lệnh
fprintd-enroll: komanda nerasta
fprintd-enroll: Kommando nicht gefunden.
fprintd-enroll: kommandot finns inte
fprintd-enroll: komut yok
fprintd-enroll: nie znaleziono polecenia
fprintd-enroll: níor aimsíodh an t-ordú
fprintd-enroll: no se encontró la orden
fprintd-enroll: no s'ha trobat l'ordre
fprintd-enroll: opdracht niet gevonden
fprintd-enroll: parancs nem található
fprintd-enroll: perintah tidak ditemukan
fprintd-enroll: príkaz nenájdený
fprintd-enroll: příkaz nenalezen
fprintd-enroll: команда не найдена
fprintd-enroll: командата не е открита
fprintd-enroll: 命令找不到
fprintd-enroll: コマンドが見つかりません