I just upgraded from 19.04 to 19.10 and am also affected by this bug.
Right now trying to get the box back. The error message is indeed
'grub_file_filters not found'. This happens at the rescue prompt with
'insmod normal' as well.
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In live cd, I managed to mount /boot, and nm'ed all
/boot/grub/i386-pc/*.mod files
The following files contain "U grub_file_filters":
gzio.mod
lzopio.mod
offsetio.mod
verifiers.mod
xzio.mod
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Public bug reported:
Upgrade from 19.10 to 20.04.
ProblemType: Package
DistroRelease: Ubuntu 20.04
Package: uvtool-libvirt 0~git169-0ubuntu1
ProcVersionSignature: Ubuntu 5.3.0-51.44-generic 5.3.18
Uname: Linux 5.3.0-51-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
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