mgetty: 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 CentOS possible default full paths are:

/sbin/mgetty - from package: mgetty

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/sbin/mgetty - from package: mgetty

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

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