eulb-apply-security-groups-to-lb: command not found

Have You tried accessing the binary with the full path?

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/eulb-apply-security-groups-to-lb - from package: euca2ools

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

On Debian possible default full paths are:

/usr/bin/eulb-apply-security-groups-to-lb - from package: euca2ools

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