mpbi: 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/mpbi - from package: mpb

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

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