Re: GRUB broken after upgrade on Macbook

[Sylvain Archenault <sylvain.archenault@laposte.net>]

I managed to fix this.

I should have run "grub-install /dev/sda" at a moment instead of
"/dev/sda3/" which lead to a corrupt mbr.

I fixed this by clearing the mbr
(http://ubuntuforums.org/showthread.php?t=811240):
dd if=fakembr80.tx of=/dev/sda bs=512 count=1

and reinstalling grub:
gptsync
grub-install /dev/sda3
update-grub

Sylvain.