lua2dox_filter: 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/lua2dox_filter - from package: texlive-luatex

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

Error in other languages:
lua2dox_filter: bevel nie gevind nie
lua2dox_filter: comandă negăsită
lua2dox_filter: comando não encontrado
lua2dox_filter: commande introuvable
lua2dox_filter: command not found
lua2dox_filter: käsku ei ole
lua2dox_filter: không tìm thấy lệnh
lua2dox_filter: komanda nerasta
lua2dox_filter: Kommando nicht gefunden.
lua2dox_filter: kommandot finns inte
lua2dox_filter: komut yok
lua2dox_filter: nie znaleziono polecenia
lua2dox_filter: níor aimsíodh an t-ordú
lua2dox_filter: no se encontró la orden
lua2dox_filter: no s'ha trobat l'ordre
lua2dox_filter: opdracht niet gevonden
lua2dox_filter: parancs nem található
lua2dox_filter: perintah tidak ditemukan
lua2dox_filter: príkaz nenájdený
lua2dox_filter: příkaz nenalezen
lua2dox_filter: команда не найдена
lua2dox_filter: командата не е открита
lua2dox_filter: 命令找不到
lua2dox_filter: コマンドが見つかりません