hpumount: 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/hpumount - from package: hfsplus

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

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