Are the disks changing in any way? Is this a Dell system? A Lenovo
system?

This has the earmarks of a firmware issue, where the BootEntry variables
are lost -- the system will then try to boot straight to disk, fail to
find a valid boot image, and be stuck; all this possibly because it
manages to remove BootEntry variables but not add them.

** Changed in: grub2 (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1748008

Title:
  System does not boot after grub upgrade

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