Install Ubuntu on Alienware 17 R4

I installed Ubuntu 18.04 on Alienware 17 R4. After the installation, I got an offer to restart the system. I clicked restart and nothing happened. And after force reboot of the system, Ubuntu can’t boot. What’s the problem?

I used instruction: https://github.com/stormhart/dev-journal/wiki/Alienware-17-R4:-Dual-Boot-Windows-10—Ubuntu-16.04

Characteristics:

  • Intel Core i7 7700HQ 2800 MHz
  • 16Gb
  • NVIDIA GeForce GTX 1070
  • 256Gb SSD