dtc-xen-client: 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/bin/dtc-xen-client - from package: dtc-xen

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

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