fdumount: 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/fdumount - from package: fdutils

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

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