vampyr: 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/vampyr - from package: undertaker

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

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