Grub build failure

snapcraft --debug
Launching a VM.
2021-02-05T16:33:44+01:00 INFO Waiting for automatic snapd restart...
snapd 2.48.2 from Canonical✓ refreshed
snap "core20" has no updates available
2021-02-05T16:34:04+01:00 INFO Waiting for automatic snapd restart...
snapd (edge) 2.49~rc1+git1126.gb1999b1 from Canonical✓ refreshed
Skipping pull grub-prepare (already ran)
Skipping pull grub (already ran)
Skipping build grub-prepare (already ran)
Building grub
+ make -j2
dd if=/root/stage/usr/lib/grub/i386-pc/boot.img of=pc-boot.img bs=440 count=1
1+0 records in
1+0 records out
440 bytes copied, 0.000170791 s, 2.6 MB/s
/bin/echo -n -e '\x90\x90' | dd of=pc-boot.img seek=102 bs=1 conv=notrunc
2+0 records in
2+0 records out
2 bytes copied, 6.8585e-05 s, 29.2 kB/s
grub-mkimage -d /root/stage/usr/lib/grub/i386-pc/ -O i386-pc -o pc-core.img -p '(,gpt2)/EFI/ubuntu' all_video biosdisk boot cat chain configfile echo ext2 fat font gettext gfxmenu gfxterm gfxterm_background gzio halt jpeg keystatus loadenv loopback linux memdisk minicmd normal part_gpt png reboot regexp search search_fs_uuid search_fs_file search_label sleep squash4 test true video
# The first sector of the core image requires an absolute pointer to the
# second sector of the image.  Since this is always hard-coded, it means our
# BIOS boot partition must be defined with an absolute offset.  The
# particular value here is 2049, or 0x01 0x08 0x00 0x00 in little-endian.
/bin/echo -n -e '\x01\x08\x00\x00' | dd of=pc-core.img seek=500 bs=1 conv=notrunc
4+0 records in
4+0 records out
4 bytes copied, 0.000180276 s, 22.2 kB/s
cp /root/stage/usr/lib/shim/shimx64.efi.dualsigned shim.efi.signed
cp: cannot stat '/root/stage/usr/lib/shim/shimx64.efi.dualsigned': No such file or directory
make: *** [Makefile:67: all] Error 1
Failed to build 'grub'.

Recommended resolution:
Check the build logs and ensure the part's configuration and sources are correct.