fdmount: 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/fdmount - from package: fdutils

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

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