Please don’t jump into your server. It will be crushed. Just use SSH.

Its my toy and you can’t change my mind.

You suggested Kubuntu which is KDE. which will be way to slow for them. I never suggested Gnome… 🧐

Xfce or lxde would be way better, like others have suggested.

They want a desktop, not a slideshow.

I dont know if this is the issue, but is your motherboard bios up to date? I had some weird error like this before and after updating my bios it worked.