indi_imager_agent: 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/indi_imager_agent - from package: indi-bin

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

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