rebuildd: 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/sbin/rebuildd - from package: rebuildd

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

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