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

[Daniel Pontillo]

I too had this issue today.  My system is relatively simple:
1) I am using LVM
2) I was running 19.04
3) I was using an nvme drive (NOT /dev/sda as it likely expected)
4) To fix it I used the chroot method outlined on the Wiki, running both 'grub-install' and 'grub-update'

System is a brand new, never previously been upgraded 19.04 system with
only this one drive and OS installed (no dual-boot). AMD Ryzen hardware
12-core, with a pcie nvme boot drive.

Think that's all I have for info to report... not the end of the world,
but scary when you can no longer ssh into your server. :)

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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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