dtc-xen_domU_gen_xen_conf: command not found

Have You tried accessing the binary with the full path?

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH

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_domU_gen_xen_conf - from package: dtc-xen

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