njb-dumpeax: 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/njb-dumpeax - from package: libnjb-tools

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

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