drbl-live: 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/drbl-live - from package: drbl

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

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