ao-usbload: 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/ao-usbload - from package: altos

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

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