I have upgrade the packages from the link provided (manual download since they're not yet accepted into focal-proposed) and grub-pc postinst script exits cleanly now. thanks.
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1896608 Title: [regression-in-stable] grub-multi-install fails with exit 1 when question grub-efi/install_devices_empty is skipped To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/1896608/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs