enq_ctnnetwork: 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

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/enq_ctnnetwork - from package: ctn

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