The problem reappeared for a third time, but in this occasion I solved
it simply by a hard reset.
Curiously a second computer in my home also exhibited screen flickering
that was solved by this method. There should be a solar storm or
something.
** Changed in: grub2 (Ubuntu)
Status: Triaged => Invalid
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https://bugs.launchpad.net/bugs/1639516
Title:
grub no longer detects the internal storage device as bootable
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