namazu: command not found

Have You tried accessing the binary with the full path?

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/namazu - from package: namazu2

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