all dietpi softwares works only on ROOT Topic is solved

[rostomzer]

that's not true. There are quite a lot of software title using their own user. Nearly all applications using their own user. Kodi is an exception.

Lxde is running only on root
Kodi is running only on root
Retropie after installation runs only under root and does not autostart after boot, it runs only after i sudo xinit then run emulationstation in terminal inside the environment

[Joulinar]

you are referring to a special group/typ of software that require access to video and audio.

Just install something else like web server, sonarr, radarr, transmission, docker, squeezelite aso. You will see they are using own user. Your statement that ALL software title running with root user is not correct.

[rostomzer]

i just want to thank everyone for being responsive. i managed to get my setup working using the custom.sh script