burnP5: command not found

Have You tried accessing the binary with the full path?

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/burnP5 - from package: cpuburn

You may install the required package with command apt-get install {package}
Error in other languages:
burnP5: bevel nie gevind nie
burnP5: comandă negăsită
burnP5: comando não encontrado
burnP5: commande introuvable
burnP5: command not found
burnP5: käsku ei ole
burnP5: không tìm thấy lệnh
burnP5: komanda nerasta
burnP5: Kommando nicht gefunden.
burnP5: kommandot finns inte
burnP5: komut yok
burnP5: nie znaleziono polecenia
burnP5: níor aimsíodh an t-ordú
burnP5: no se encontró la orden
burnP5: no s'ha trobat l'ordre
burnP5: opdracht niet gevonden
burnP5: parancs nem található
burnP5: perintah tidak ditemukan
burnP5: príkaz nenájdený
burnP5: příkaz nenalezen
burnP5: команда не найдена
burnP5: командата не е открита
burnP5: 命令找不到
burnP5: コマンドが見つかりません