Sadly the options of 'noacpi' or 'acpi=off' is no longer given as options due to the way the bootloader has been updated (sigh!) - and Zorin are not responsible. (If you look at my dual boot video 26-27 minutes in you will see what I mean: https://vimeo.com/user15592214)
Look at the answer with 4 votes as the solution here: