dcm_ctnto10: 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/dcm_ctnto10 - from package: ctn

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

Error in other languages:
dcm_ctnto10: bevel nie gevind nie
dcm_ctnto10: comandă negăsită
dcm_ctnto10: comando não encontrado
dcm_ctnto10: commande introuvable
dcm_ctnto10: command not found
dcm_ctnto10: käsku ei ole
dcm_ctnto10: không tìm thấy lệnh
dcm_ctnto10: komanda nerasta
dcm_ctnto10: Kommando nicht gefunden.
dcm_ctnto10: kommandot finns inte
dcm_ctnto10: komut yok
dcm_ctnto10: nie znaleziono polecenia
dcm_ctnto10: níor aimsíodh an t-ordú
dcm_ctnto10: no se encontró la orden
dcm_ctnto10: no s'ha trobat l'ordre
dcm_ctnto10: opdracht niet gevonden
dcm_ctnto10: parancs nem található
dcm_ctnto10: perintah tidak ditemukan
dcm_ctnto10: príkaz nenájdený
dcm_ctnto10: příkaz nenalezen
dcm_ctnto10: команда не найдена
dcm_ctnto10: командата не е открита
dcm_ctnto10: 命令找不到
dcm_ctnto10: コマンドが見つかりません