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

[Bernd Porr]

After the rescue via live USB stick one can halt updating of the grub
packages till a proper fix is available. I've done it with "dselect"
(hotkey "H").

*== Opt admin    grub-pc      amd64      i386       2.02-2ubunt 2.02-2ubunt
*== Opt admin    grub-pc-bin  amd64      i386       2.02-2ubunt 2.02-2ubunt 
*== Opt admin    grub2-common amd64      i386       2.02-2ubunt 2.02-2ubunt

or you can it on the commandline:

apt-mark hold grub2
apt-mark hold grub2-pc
apt-mark hold grub-efi-amd64-signed

and any other which are currently installed.

/Bernd

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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:
  New

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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