I have an Alienware 15 R3. I had Mate 16.04 installed and something happened when I shutdown the computer and closed the laptop. When I turn it back on the computer would not boot. I am trying to install 18.04. I have edited the grub.conf file with solutions I have found with google such as adding acpi=off nomodeset to the end of the lines with Linux. These solutions have not helped.
I created 2 bootable USB thumb drives and a DVD image. I get the same with all three the install hangs.