cobfusc: 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/cobfusc - from package: cutils

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

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