mppg: 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/mppg - from package: makepp

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

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