I just installed both this and the 2025-12-08 update on two computers, following the guidance. On an nvidia laptop (where I usually expect issues) it went smoothly, but on my mini-PC I had the Error: symbol 'grub_memcpy' not found problem despite having run both install-grub and update-grub. I was able to fix it without needing to chroot from a live USB by following these steps:
- Enter BIOS and reboot with a boot device override from UEFI OS to Manjaro
- Follow the remaining step in [Testing Update] 2025-11-19 - Plasma 6.5.3, KDE Frameworks 6.20.0, Firefox 145.0.1 - #3 by braveheartleo (essentially just
sudo cp /boot/grub/x86_64-efi/core.efi /boot/efi/EFI/BOOT/BOOTX64.EFI, creating the latter directory)
On subsequent reboots, the PC came back up normally.
The output of install-grub indicated the problem, but I didn’t heed this in time:
Warning: GRUB bootloader at '/boot/efi/EFI/Manjaro' was updated.
Your booted entry 'UEFI OS' is not the same as 'Manjaro'.
This may be a rescue ISO, but if not check your EFI boot priority.
On the nvidia laptop, I just had to set the default session back to X11 in the SDDM settings.