[Bug 1051280] Re: reboot into grub prompt after system update

[Phillip Susi]

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

Status in “grub2” package in Ubuntu:
  Invalid

Bug description:
  Every time I do a system update, the alter reboot ends-up into a grub
  prompt like if grub configuration was not available.

  I first tought that this was only happening when upgrading the kernel
  but no, it does also happend at other times as well.  I don't know
  what package it is related to, I presume it's a grub2 problem invoke
  by another package needing to call update-grub but can't tell yet?

  It started doing this around 1-2 months ago durring early snapshots
  of 12.10 (upgraded from 12.04 to it).  This morning i noticed the
  upgrade to grub2 and i was hoping this would be fixed but no, it
  happend again.

  In order to fix the problem I use the live DVD from where I CTRL-ALT-F1 into command prompt then:
  I mount my / partition
  mount -t xfs /dev/sda3 /mnt

  mount everything else required for update-grub2:
  mount -o bind /dev /mnt/dev
  mount -o bind /proc /mnt/proc
  mount -o bind /sys /mnt/sys

  Then update grub:
  update-grub2

  Note that a the last 2-3 updates (of more than 100+ packages) I
  manually invoked update-grub2 right after, with no result beside
  getting a grub prompt at reboot.  Other cases (where I would not be
  invoking manual grub update after reboot) there would be a proper grub
  greeter with choices but the kernel would panic at boot time...
  although this kernel had not been updated in days?!?!

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