Hi, The problem is not limited to amd64. I see this problem on arm64. On a FreedomBox arm64 image, on a Raspberry Pi 3B+ (when booted with UEFI firmware[1]) when grub efi packages are upgraded, boot fails with the error 'symbol `grub_is_lockdown` not found'.
Links: 1) https://github.com/pftf/RPi3 Thanks, -- Sunil
