mppi: 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/mppi - from package: makepp

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

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