iptux: 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/iptux - from package: iptux

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