mulog: 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/mulog - from package: museekd-tools

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

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