please , need a guide on headless sunshine setup on ubuntu

[khaqeeha-creator]

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i tried so many methodslike cia xorg , modelines , edid configs and some more,,, but none of them succeed, my system is all messed up now , i somehow created a cirtual monitor via edid but the sunshine wouldnt open , complete black screen , tho the touch works , and in logs there were couple of error like couldnt confire display , i asked gemini cli to fix and it idk what it did but my sunshine config also messed up now and my phone wont connect to it saying firewall error , im just hopeless

if someone has succeeded, or know the ball then please help me , the display i want to stream to is 2140x1080 120hz , nvidia dgpu(preferred) / amd igpu , ubuntu26.04 lts

( im not an engineer , im just a tech enthusiast , my laptop display is gone so i use tv for monitor but i cant take tv out that why i want to setup this so i can stream to my phone )