1. Install Ubuntu 2. Select closed source Nvidia driver during install 3. Done
I don't recall having to mess with secure boot -- is that some dual boot thing?
why would she need that? 1. on almost all big distros thats included by default 2. 99% of user do not use a GPU they just browse the web.
1. Debian has ideological reasons for not including nvidia. If you're not a proponent of FOSS software, you wouldn't even look to Debian. It's popular because it's a good distro, but it's a very particular kind of distro.
2. Debian Stable does now include nvidia drivers. Yes, they relented, specifically because of situations like yours. Personally, I think it's a good thing they relented.
Thus, a side effect is no need to install any third-party drivers at all.
Edit: No, most users do not have Nvidia GPU. Most Steam gamers do. But gamers are not entire computer market; it is just a small slice of the market. Meanwhile, Intel iGPU is the majority.