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[Colin King <1322148@xxxxxxxxxxxxxxxxxx>]

The underlying issue was that this was booting in CSM mode and the
x2apic wasn't being configured correctly causing an SMP boot to hang.

We solved this issue by using the EFI grub loader to avoid booting in
CSM mode.

1. add /boot/efi /etc/fstab
2. install grub-efi

running grub-install --target=x86_64
and reboot.

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https://bugs.launchpad.net/bugs/1322148

Title:
  [MacBookPro11,1] Utopic freezes on boot

Status in “linux” package in Ubuntu:
  Won't Fix

Bug description:
  Running latest utopic on Macbook Pro Retina causes it to freeze on
  boot. I can't file this with ubuntu-bug because the system is not
  bootable, but the hardware information can be read from bug 1317862.

  Attached is a screenshot of where it freezes when booted in recovery
  mode.

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