ebur128: 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/ebur128 - from package: ebumeter

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

Error in other languages:
ebur128: bevel nie gevind nie
ebur128: comandă negăsită
ebur128: comando não encontrado
ebur128: commande introuvable
ebur128: command not found
ebur128: käsku ei ole
ebur128: không tìm thấy lệnh
ebur128: komanda nerasta
ebur128: Kommando nicht gefunden.
ebur128: kommandot finns inte
ebur128: komut yok
ebur128: nie znaleziono polecenia
ebur128: níor aimsíodh an t-ordú
ebur128: no se encontró la orden
ebur128: no s'ha trobat l'ordre
ebur128: opdracht niet gevonden
ebur128: parancs nem található
ebur128: perintah tidak ditemukan
ebur128: príkaz nenájdený
ebur128: příkaz nenalezen
ebur128: команда не найдена
ebur128: командата не е открита
ebur128: 命令找不到
ebur128: コマンドが見つかりません