xmbmon: 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/xmbmon - from package: xmbmon

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

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