burn: 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/burn - from package: burn

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

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