audacious: 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/audacious - from package: audacious

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

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