ngetty-argv: 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:

/sbin/ngetty-argv - from package: ngetty

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

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