reboot -f does *not* flush the disk caches, thus what you just wrote (
grub ) is lost.  This is like complaining there is a bug because you ran
rm -rf / and successfully deleted all of your files.  There are many
things you shouldn't do including yanking out the drive while it is in
use and dropping it on the floor, but you won't find warnings not to do
such things in manuals.

Passing -f to the reboot command is the equivalent to yanking out the
power cord.  Don't do that.


** Changed in: grub2 (Ubuntu)
       Status: Confirmed => Invalid

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https://bugs.launchpad.net/bugs/1051280

Title:
  reboot into grub prompt after system update

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