Release Notes for Alpine 3.20.0

Base System

grub 2.12

When upgrading existing installations using grub on UEFI systems, make sure to update the installed bootloader before rebooting, otherwise your machine might not boot.

The problem is that grub added new configuration that executes fwsetup --is-supported. The problem is that grub 2.06 does not supported the --is-supported argument yet, causing grub to unconditionally try to reboot into firmware.

Here is an example assuming the default setup. Don't blindly copy this examples but verify what's applicable to your system.

EFI


 # grub-install --target=$target --efi-directory=$efi_directory \
    --bootloader-id=alpine --boot-directory=/boot --no-nvram
 # install -D $efi_directory/EFI/alpine/grub$fwa.efi $efi_directory/EFI/boot/boot$fwa.efi

target
The relevant target for your system
efi_directory
Either /boot/efi or /boot. Run awk '$2 ~ /boot/ && $3 ~ /fat|msdos/ { print $2 }' /proc/mounts to confirm.
fwa
The respective firmware architecture for your system

Short-term work-around

A short-term work-around to get the system bootable again is to restore the backup configuration:

cp /boot/grub/grub.cfg.back /boot/grub.cfg

This should allow you to boot the system again to fix it permanently. This will be reverted again when either grub or the kernel is updated again.
This will only work if update-grub has not been executed any more since the upgrade to grub 2.12.