mumudvb: 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/mumudvb - from package: mumudvb

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

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