Update from today has resolved the issue:
grub-common/focal-updates 2.04-1ubuntu26.6 amd64 [upgradable from:
2.04-1ubuntu26.4]
grub-efi-amd64-bin/focal-updates 2.04-1ubuntu26.6 amd64 [upgradable from:
2.04-1ubuntu26.4]
grub-efi-amd64-signed/focal-updates 1.142.8+2.04-1ubuntu26.6 amd64 [upgradable
from: 1.142.6+2.04-1ubuntu26.4]
grub-efi-amd64/focal-updates 2.04-1ubuntu26.6 amd64 [upgradable from:
2.04-1ubuntu26.4]
grub-efi/focal-updates 2.04-1ubuntu26.6 amd64 [upgradable from:
2.04-1ubuntu26.4]
grub2-common/focal-updates 2.04-1ubuntu26.6 amd64 [upgradable from:
2.04-1ubuntu26.4]
** Changed in: grub-efi-amd64-signed (Ubuntu)
Status: New => Fix Released
** Changed in: dpkg (Ubuntu)
Status: New => Fix Released
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https://bugs.launchpad.net/bugs/1901477
Title:
installed grub-efi-amd64-signed package post-installation script
subprocess returned error exit status 1
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