upnp-router-control: 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/upnp-router-control - from package: upnp-router-control

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

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