dubdv: 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 CentOS possible default full paths are:

/usr/bin/dubdv - from package: libdv-tools

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/bin/dubdv - from package: libdv-bin

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

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