dtc-xen-volgroup: 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 Debian possible default full paths are:

/usr/sbin/dtc-xen-volgroup - from package: dtc-xen

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

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