mbget: command not found

Have You tried accessing the binary with the full path?

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/mbget - from package: ears

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