dev_make_keypair: 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/dev_make_keypair - from package: vboot-utils

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

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