mgp: 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/mgp - from package: mgp

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

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