enq_ctndisp: 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/enq_ctndisp - from package: ctn

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

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