aptdcon: 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/aptdcon - from package: aptdaemon

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

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