stealth: 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/stealth - from package: stealth

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

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