It turns out that the installation without nvidia drivers and the secureboot 
option also causes errors. After some time using the laptop, the screen freezes 
and only holding down the power button allows you to turn off. Unfortunately, 
after switching on again, there was a problem with the grub welcome screen. I 
could not even enter the bios settings. There was only a black screen. I had to 
press the power button several times until I was able to do it after an hour.
I have been using ubuntu for several years and this has never happened to me. 
The problem appeared a week ago on January 23. Previously, everything was fine.

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https://bugs.launchpad.net/bugs/1798961

Title:
  Random unrecoverable freezes on Ubuntu 18.10

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