unp: 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/unp - from package: unp

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

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