lvmconf: 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/lvmconf - from package: lvm2

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

On Debian possible default full paths are:

/sbin/lvmconf - from package: lvm2

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

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