openvt: 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/bin/openvt - from package: kbd

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

On Debian possible default full paths are:

/bin/openvt - from package: kbd

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

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