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I've been dual booting Ubuntu on my laptop and for a few months its been perfect. Today however when booting up this error has appeared, and despite numerous restarts nothing has resolved it:

Kernel panic - not syncing:  Timeout: Not all CPUs entered broadcast exception handler
Kernel Offset: disabled
Rebooting in 30 seconds.

When booting into Windows 10 I have no problems or issues, so I dont think its a hardware issue, maybe an update that has prevented a Ubuntu boot.

I've looked around for solutions but most say it's a hardware issue (which I doubt) or I need to update the Intel Microcode, however if I can load into Ubuntu and install it how can I possibly update the microcode?

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If your CPU is an Intel Braswell (like mine is, namely in my case a N3050) then you might be able to solve the issue by booting the kernel with option :

max_cstate=1

Or, alternatively, set maximum Cstate to C1 in your BIOS/UEFI.

It worked for me. I had the same sort of issue.

If it's a low consumption and low TDP CPU like the N3050, that shouldn't be much of an issue, compared to not having any linux kernel booting ^^

Ref :

bugzilla

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