dtc_kill_vps_disk: 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_kill_vps_disk - from package: dtc-xen

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

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