dh_lua: 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/dh_lua - from package: dh-lua

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

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