gupnp-dlna-info: 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/gupnp-dlna-info - from package: gupnp-dlna-tools

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

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