Comment 84 for bug 1594023

I had similar issues when i installed Ubuntu i tried to boot ubuntu but it got hang because of ACPI error
i made acpi off so it can boot in but when i tried to shut down it got hand this time

Reason is simple
Its related to your graphic card

step 1:
i went through these proceess
->booted into system with acpi off from grub command
since i was not able to without doing so

step 2:
later when i got into ubuntu
i did
(this step neccessary or not i'm not sure, included it since i had followed it) i think its very necessary
->sudo apt-get update
->sudo apt-get upgrade

step 3:

Install graphic card Driver

https://www.tecmint.com/things-you-mostly-need-to-do-after-installing-ubuntu-16-04/4/

after doing this once you might hang but on restart you wont need acpi off
you can run ubntu without any hang during start splash screen or shutdown splash screen