vbutil_what_keys: 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_what_keys - from package: vboot-utils

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

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