enable_dev_usb_boot: 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/enable_dev_usb_boot - from package: vboot-utils

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

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