Comment 40 for bug 1530405

@seccanj , I have experienced this same issue and was able to solve with the same steps.

 - install 16.04.1

 - get intel-microcode from "unity" -> "additional drivers"

 - blacklist nouveau

 - $ update init-ramfs -u

this resolves boot and shutdown lockup.

however, I've accidentally updated the kernel twice after resolving it with these steps.

and in both cases, even after uninstalling the new kernel [ even latest 4.4.0-53]
the issue returns randomly on boot and even once on shutdown

[I'm using Dell 7559 6700HQ]
* also using acpi_osi="!Windows 2015" does not resolve this