cbootimage: 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 CentOS possible default full paths are:

/usr/bin/cbootimage - from package: cbootimage

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/bin/cbootimage - from package: cbootimage

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

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