mppr: 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/mppr - from package: makepp

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

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