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

Symptoms:

  • 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.
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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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