This is not really a question, but my attempt to document a solution that worked for my problem.


  • After some update there was an infinite booting loop before entering grub: after showing motherboard picture for several seconds computer started a reboot. That is, I was easily able to enter BIOS to change boot order but I couldn't enter grub by holding Shift button (there was a black screen and nothing happened).
  • This behavior was after updates on Ubuntu 16.04 and after installing updates on fresh Ubuntu 18.04.

What helped me was to disable CSM (Compatibility Support Module) in BIOS (exact steps to do that depend on the installed motherboard). I was able to successfully use Ubuntu after doing that.

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