vpbconf: 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/sbin/vpbconf - from package: libvpb0
/usr/lib/debug/usr/sbin/vpbconf - from package: libvpb-dbg

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

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