vbutil_firmware: 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/vbutil_firmware - from package: vboot-utils

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

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