Recently I have updated my lubuntu to 18.04.
I don't use it regularly but I like to have it on the side of my window 10.
Anyway today I boot and decide to use it and get this error.
[0.000000] [Firmware Bug]: TSC_DEADLINE disabled du to errata; please update microcode to version 0x22 (or later)
and two MMIO read fault.

At first it sounds really dramatic and I was thinking, "Nice ... I never get a problem with Windows Update and when its Linux it doesn't work ..."

But lubuntu boots normally after so it's not a blocking problem.

So I do what most of us do in case like this, go to Google and search to know what the hell is going on.

And the answer is simple, my CPU microcode isn't up to date to prevent Spectre, one apt get install and a reboot later my 4700HQ is patched in 0x24 version and protected for Spectre where my windows didn't patch anything and worst disable the KB that I have installed manually before the last big update.

So thanks Linux, you scared me with your error but it was a good job to throw it :)