hpset: 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/hpset - from package: djtools

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

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