lvmchange: 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/lvmchange - from package: lvm2

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

On Debian possible default full paths are:

/sbin/lvmchange - from package: lvm2

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

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