humount: 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/humount - from package: hfsutils

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

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