ctpl: 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/ctpl - from package: ctpl

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