mftraining: 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 Debian possible default full paths are:

/usr/bin/mftraining - from package: tesseract-ocr

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

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