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

[Kirk Anderson]

I found the same thing.  I was required to use "reboot -f" during the
rescue CD, otherwise it complained that it wouldn't let me reboot simply
using "reboot".  But that "reboot -f" did NOT cause any side effects.
Only the one issued from the running OS.  AND, I didn't even have to do
the "grub-install /dev/sda" manually.  Even if apt auto-updated packages
which required an automatic grub-install and then I would later to a
"reboot -f", the next reboot would fail.

My colleague commented that the "Don't do that" sounds like something
Microsoft Tech Support would claim :-)

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

Title:
  reboot into grub prompt after system update

Status in “grub2” package in Ubuntu:
  Confirmed

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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