I obviously solved it rebooting with the liveCD of Ubuntu and executing update-grub, update-grub2 and grub-mkconfig (just to be sure, it didn't work with only update-grub), but I know what to do, other users don't.
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1155993 Title: GRUB error after Ubuntu Raring desktop amd64 install To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/1155993/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs