mokutil: 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/mokutil - from package: mokutil

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

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