cunloop: command not found

Have You tried accessing the binary with the full path?

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/cunloop - from package: cutils

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