mpcd: 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/sbin/mpcd - from package: atm-tools

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

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