packet_worker_runner: 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/bin/packet_worker_runner - from package: ruby-packet

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

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