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

[Vincent Fortier]

The following is equivalent to "yanking out the power cord":
echo 1 > /proc/sys/kernel/sysrq
echo b > /proc/sysrq-trigger

AFAIK not reboot -f.

Now, it's not like reboot -f had been triggerred at the millisecond
where th update-grub or kernel upgrade process has been completed...  or
used in conjunction with a apt-get dist-upgrade -f && reboot -f...
really, NO!  actually, many minutes went by.

I feel like we are feeding the trolls now... so nevermind, plain simple,
keep it as invalid, lets not fix that and simply keep it for
documentation sake.  Eventually somebody else will find and fix the real
root-cause through another bug entry and perhaps even refer to this one.

And yeah, Kirk you are right, this sounds like an MS 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:
  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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