avg_audioplayer: 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/avg_audioplayer - from package: python-libavg

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

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