drbl-aoe-serv: 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-aoe-serv - from package: drbl

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

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