vgck: 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/vgck - from package: lvm2

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

On Debian possible default full paths are:

/sbin/vgck - from package: lvm2

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

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