To those who are affected, are you using grub1 or grub2? Given the output above "found: /boot/grub/menu.lst" I'd guess grub1, not grub2. Thus it's wrong for mdadm to call `update-grub` command, as that's not needed.
To those who are affected, are you using grub1 or grub2? menu.lst" I'd guess grub1, not grub2. Thus it's wrong for mdadm to call `update-grub` command, as that's not needed.
Given the output above "found: /boot/grub/