jumble: 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/lib/fastdnaml/bin/jumble - from package: fastdnaml

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

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