dualcoax: 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/dualcoax - from package: atlc

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

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