Ok I have used boot-repair to convert it to EFI and reinstall rEFInd and I see 4 CPUs with a 3.9.11. Great!
For an unkown reason, the boot gets stuck at "Loading initial ramdisk" with a 3.11 rc but it must be something else (maybe a boot repair got confused...I'm going to check my grub config (I suppose grub-EFI config files are the same as the grug "legacy" ones). -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1197451 Title: Ubuntu fails to properly boot on Macbook Air 2013 6,1 & 6,2 To manage notifications about this bug go to: https://bugs.launchpad.net/linux/+bug/1197451/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs