chvt: 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/chvt - from package: kbd

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

On Debian possible default full paths are:

/bin/chvt - from package: kbd

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

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