With focal image released 2020-09-07 while retrofitting an image an update to the grub-efi-amd64-signed package will be attempted, but it fails:
Setting up grub-efi-amd64-signed (1.142.6+2.04-1ubuntu26.4) ... Trying to migrate /boot/efi into esp config dpkg: error processing package grub-efi-amd64-signed (--configure): installed grub-efi-amd64-signed package post-installation script subprocess returned error exit status 1
With focal image released 2020-09-07 while retrofitting an image an update to the grub-efi- amd64-signed package will be attempted, but it fails:
Setting up grub-efi- amd64-signed (1.142. 6+2.04- 1ubuntu26. 4) ... amd64-signed (--configure): amd64-signed package post-installation script subprocess returned error exit status 1
Trying to migrate /boot/efi into esp config
dpkg: error processing package grub-efi-
installed grub-efi-