I recently bought a new Lenovo IdeaPad 520-15IKB 81BF005JRK laptop and 
installed Ubuntu (18.10 downloaded a few days ago, during install, updates were 
installed). But I cannot work with it as immediately after turning on the 
laptop, the processor (i8520u) on all cores operates at maximum frequencies 
(over 3 GHz) and goes into hard trotting with pauses of 20-30 seconds. I have 
some time open the console, but I can not execute any command. It's owful.
I cann't install cpufrequtils, cpupower  or  other software

 I tried to boot from a live-usb (there are no such problems) and edit 
/boot/config-* :
#CONFIG_CPU_FREQ_GOV_PERFORMANCE
CONFIG_CPU_FREQ_GOV_POWERSAVE=y

the governor was established to POWERSAVE but the laptop still works at the 
maximum frequency.
may be I can Add `intel_pstate=disable` to `GRUB_CMDLINE_LINUX_DEFAULT` in 
/etc/default/grub 
but I don't know how update-grub at GPT UEFI partition.

It even sometimes seems to me that with each new start in such a boost
it slows down more and more, I'm afraid, as it were, that it does not
kill the processor on a new computer. After the first installation, I
didn’t immediately notice trotting and left the computer for the night.
And now it's just not possible to work with him

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https://bugs.launchpad.net/bugs/1598394

Title:
  intel_pstate has too aggressive frequency selection

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