[Bug 1889509] Re: grub boot error : "symbol 'grub_calloc' not found

[halfgaar]

*** This bug is a duplicate of bug 1889556 ***
    https://bugs.launchpad.net/bugs/1889556

I had an amazon EC2 Ubuntu 18.04 instance fail to boot. Grub was updated
to the fixed version on aug 3 (2.02-2ubuntu8.17). A fix for #1889556
that prevents this in the future may have been released, but the broken
state the machine is in, is not recovered.

Amazon AWS is especially tricky, because you don't have a VGA console to
see the error in. Even tier 1 support only has virtual console access,
which is not there yet.

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https://bugs.launchpad.net/bugs/1889509

Title:
  grub boot error : "symbol 'grub_calloc' not found

Status in grub2 package in Ubuntu:
  Confirmed
Status in grub2 package in Debian:
  Unknown

Bug description:
  After updating grub2 (to 2.02~beta2-36ubuntu3.26) and rebooting, my
  server does not boot:

  Booting from Hard Disk 0...
  error: symbol `grub_calloc' not found.
  Entering rescue mode...
  grub rescue> _

  I rebooted 3 servers in this way (all running Ubuntu 16.04.6 LTS) and
  all hung.

  A lot of other people are reporting the same problem at:

  https://askubuntu.com/questions/1263125/how-to-fix-a-grub-boot-error-
  symbol-grub-calloc-not-found.

  ---

  Above most likely means that dpkg debconf no longer knows about the
  correct drives to install grub onto.

  Please boot & mount all the target disks and execute

  $ sudo dpkg-reconfigure grub-pc

  You will be asked which drives to install grub onto, and then grub
  will be installed onto them, and more importantly, it will remember
  where to install grub to, on all future upgrades.

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