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

[Ronzo]

Before the upgrade debconf-show grup-pc output (on Ubuntu 19.04) is:

debconf-show grub-pc
  grub-pc/install_devices_failed_upgrade: true
  grub2/device_map_regenerated:
  grub2/unsigned_kernels:
  grub-pc/install_devices_empty: false
  grub2/kfreebsd_cmdline_default: quiet splash
  grub-pc/chainload_from_menu.lst: true
  grub-pc/install_devices_failed: false
  grub-pc/hidden_timeout: false
  grub2/kfreebsd_cmdline:
  grub2/linux_cmdline_default: nomodeset elevator=noop
  grub2/force_efi_extra_removable: false
  grub2/unsigned_kernels_title:
  grub2/linux_cmdline:
* grub-pc/install_devices: /dev/disk/by-id/scsi-0QEMU_QEMU_HARDDISK_drive-scsi0-0-0-0-part1
  grub-pc/timeout: 3
  grub2/update_nvram: true
  grub-pc/postrm_purge_boot_grub: false
  grub-pc/disk_description:
  grub2/no_efi_extra_removable: false
  grub-pc/kopt_extracted: false
* grub-pc/install_devices_disks_changed: /dev/disk/by-id/scsi-0QEMU_QEMU_HARDDISK_drive-scsi0-0-0-0-part1
  grub-pc/partition_description:
  grub-pc/mixed_legacy_and_grub2: true

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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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