mbtg: 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/mbtg - from package: mbt

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