dtc_reinstall_os: 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_reinstall_os - from package: dtc-xen

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

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