Bug#931896: grub-efi-amd64: symbol `grub_file_filters` not found

[dirdi]

Package: grub-pc
Followup-For: Bug #931896

I ran into this bug, too. The values of all set variables (prefix, root)
seemed to be sane and "ls $prefix/i386-pc" returned a list of *.mod files as
expected. However, when I tried to load the "normal" module, the error was
risen again:

> grub rescue> insmod normal
> error: symbol 'grub_file_filters' not found.

Hence, I do not think that this is caused by a misconfiguration of some path
variable. Downgrading to 2.02+dfsg1-20 resvoled the issue for me, too.

apt log snippet:
> Preparing to unpack .../19-grub-pc_2.04-1_amd64.deb ...
> Unpacking grub-pc (2.04-1) over (2.02+dfsg1-20) ...
> Preparing to unpack .../20-grub2-common_2.04-1_amd64.deb ...
> Unpacking grub2-common (2.04-1) over (2.02+dfsg1-20) ...
> Preparing to unpack .../21-grub-pc-bin_2.04-1_amd64.deb ...
> Unpacking grub-pc-bin (2.04-1) over (2.02+dfsg1-20) ...
> Preparing to unpack .../22-grub-common_2.04-1_amd64.deb ...
> Unpacking grub-common (2.04-1) over (2.02+dfsg1-20) ...
> ...
> Setting up grub-common (2.04-1) ...
> Installing new version of config file /etc/grub.d/00_header ...
> Installing new version of config file /etc/grub.d/10_linux ...
> Installing new version of config file /etc/grub.d/20_linux_xen ...
> ...
> Setting up grub2-common (2.04-1) ...
> Setting up grub-pc-bin (2.04-1) ...
> Setting up grub-pc (2.04-1) ...
> Installing for i386-pc platform.
> grub-install: warning: File system `ext2' doesn't support embedding.
> grub-install: warning: Embedding is not possible.  GRUB can only be
> installed in this setup by using blocklists.  However, blocklists are
> UNRELIABLE and their use is discouraged..
> Installation finished. No error reported.
> Generating grub configuration file ...
> Found background image: .background_cache.png
> Found linux image: /boot/vmlinuz-4.19.0-5-amd64
> Found initrd image: /boot/initrd.img-4.19.0-5-amd64
> Found linux image: /boot/vmlinuz-4.19.0-4-amd64
> Found initrd image: /boot/initrd.img-4.19.0-4-amd64
> done