AdunCore: 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/AdunCore - from package: adun.app

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

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