[Bug 1848797] Re: After upgrading to 19.10, boot screen shows: "Error: symbol 'grub_file_filters' not found."

[Steve Langasek]

Marking this bug as higher severity doesn't address the fundamental
problem that users encountering this issue have an Ubuntu install which
does not know where their boot disk is.  Certainly, at install time
Ubuntu knew, but something has changed afterwards with the system which
causes grub on upgrade to install to the wrong place - leaving the
actual boot disk with an old, incompatible grub installed.

As part of the recent grub security update, we have identified several
improvements that will ensure grub always successfully installs to *a*
disk.  But it is not possible to ensure that this is the *correct* disk.

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https://bugs.launchpad.net/bugs/1848797

Title:
  After upgrading to 19.10, boot screen shows: "Error: symbol
  'grub_file_filters' not found."

Status in grub2 package in Ubuntu:
  Confirmed
Status in grub2 source package in Eoan:
  Confirmed

Bug description:
  After upgrading to 19.10 the boot screen shows the following error:

  Error: symbol 'grub_file_filters' not found.
  Entering rescue mode...

  I could fix it after i booted Ubuntu 19.10 live and used the chroot
  repair method as described here
  https://wiki.ubuntuusers.de/GRUB_2/Reparatur/#chroot-Methode (german)

  Workaround
  ----------
  From https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/1848797/comments/18
  "In any case, right now the best thing to do to repair is to boot from a Live image (USB or CD-ROM), and follow the steps in https://help.ubuntu.com/community/Grub2/Installing#via_ChRoot to repair GRUB by hand, or reinstall."

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