djmount: 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/djmount - from package: djmount

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

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