I am currently using a legitimate copy of Windows 11, on the latest version. Just started getting this message after the latest update.
Considering I already have Linux and Mac as alternatives, if they actually pull my license they will just lose a lifelong customer. Their business decisions truly boggle the mind…
You can always reinstall GRUB with Super GRUB2 Disk.
@daggermoon I just use a live boot usb,
mount /dev/sda1 (or whatever root is) /mnt
mount /dev/sda3 (or whatever EFI is) /mnt/boot/efi
mount --bind /dev /mnt/dev
mount --bind /dev/pts /mnt/pts
mount --rbind /sys /mnt/sys
mount --rbind /proc /mnt/proc
cp /etc/resolv.conf /mnt/resolv.conf
chroot /mnt
grub install /dev/sda (or whichever drive you want)