dell-9570.md

Here's how I got Ubuntu 18.04 working on the Dell "New XPS" 9570 with the i9-8950HK. Note that I only used this to setup Linux-only machines. Good luck!

BIOS configuration

1. Change SATA Operation from RAID to AHCI (this probably messed with Windows, but I don't use Windows on this machine)
2. Disable secure boot (we'll be using an unsigned kernel. you can sign it etc yourself if you want; good luck)
3. Disable microphone (optional)
4. Disable webcam (optional)

Installing Ubuntu

1. When you get the GRUB menu, press "e" on the entry you'd like to boot and add nomodeset to the linux cmdline (before the --- if there is one I guess?). Press Ctrl-x to continue boot.
2. Interact with the installer to completion. After reboot, mash shift to make sure the grub menu comes up.
3. Repeat step 1.
4. Edit /etc/default/grub and add i915.alpha_support=1 to GRUB_CMDLINE_LINUX_DEFAULT
5. Install a recent kernel from http://kernel.ubuntu.com/~kernel-ppa/mainline/?C=N;O=D. you'll need both linux-headers packages, linux-image-unsigned, linux-modules. I recommend getting the generic one, not lowlatency, but it's up to you.

Boom! This doesn't deal with the nvidia graphics, but this should get you a reasonably stable experience using just the Intel GPU.

I experienced some flickers after following your tutorial. I needed to update the Kernel up to version 4.17 in order to get Ubuntu run properly.
After that, I proceeded with Nvidia driver installation to enable the GTX1050Ti.