duarouter: 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/duarouter - from package: sumo

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

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