acpi=off is the only way to USB Live Ubuntu/Lubuntu, which eventually shows up only 1 processor (for i7 6700HQ), no power option, no brightness control etc. There are couple of people suffering from the same,
Unable to run Ubuntu on a MSI laptop without disabling ACPI
Sony VAIO laptop SVF11N11CLB not start Ubuntu 16.04 without acpi = off
Booting Ubuntu with "acpi=off" grub parameter
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1336451
How to resolve the issue? Such that processor, power options, brightness control and other ubuntu options are normalized. Such things need to be sorted out.