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

[Phillip Susi]

reboot -f is the same as those other two commands, and insulting people
is not helpful.  If you can't abide by the Ubuntu code of conduct and be
respectful of others, you are welcome to look elsewhere for people who
support a free OS and enjoy being insulted.

If you feel the man page for reboot is not clear enough, please file a
bug against util-linux asking for it to be improved.  I am not blaming
you for not understanding it, I'm just telling you that if doing that
immediately after installing grub is the only way to reproduce this
problem, it is not a bug in grub.

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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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