krakatoa: 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/krakatoa - from package: why

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

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