gmbi: 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/gmbi - from package: pvm-examples

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

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