aptoncd: 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/aptoncd - from package: aptoncd

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

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