vboxgetty: 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:

/usr/sbin/vboxgetty - from package: isdn4k-utils-vboxgetty

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

On Debian possible default full paths are:

/usr/sbin/vboxgetty - from package: isdnvboxserver

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

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