mandos-monitor: 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/sbin/mandos-monitor - from package: mandos

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

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