Public bug reported:

Booting and installing from a live usb for trusty does work. However, on
restart the machine will not boot. It hangs at:

https://www.dropbox.com/s/behviox991o01o1/2014-02-23%2016.15.15.jpg

Per apw in #ubuntu-kernel a test to add nr_cpus=1 does work to boot the
machine.

Note that wifi does not work at this point, but it does work in the live
usb boot.

For more information I did hit this with both the 3.13.0-8 and 3.13.0-11
kernels as I tried to update.

--- Original notes ---

I'm attempting to install and run 14.04 trusty on a macbook air in a
dual boot configuration. I have a Mac 64bit iso bootable usb device that
I used to install on top of refind. The very first time I installed and
setup it worked. I was in Ubuntu. I installed updates and some basic
packages and when I rebooted it would no longer boot.

I had gotten an updated kernel so I attempted to boot to the older -08
kernel with no luck.

I then attempted to reinstall. I figured I could avoid updates for the
moment. I used the USB stick to do an install using the "Remove 14.04
and install" option. When it was done, it would not boot just as before.

I attempted to use the usb stick to rebuild grub using
http://howtoubuntu.org/how-to-repair-restore-reinstall-grub-2-with-a
-ubuntu-live-cd with no luck.

I've tried setting boot params in grub of nomodeset noapic. When I turn
off the quiet mode I get the following screenshot where it hangs very
early in the boot process around "Booting SMP configuration".

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: linux-generic 3.13.0.8.12
ProcVersionSignature: Ubuntu 3.13.0-8.28-generic 3.13.2
Uname: Linux 3.13.0-8-generic x86_64
NonfreeKernelModules: wl
ApportVersion: 2.13.2-0ubuntu4
Architecture: amd64
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC0:  ubuntu     3336 F.... pulseaudio
 /dev/snd/controlC1:  ubuntu     3336 F.... pulseaudio
CasperVersion: 1.337
CurrentDesktop: Unity
CurrentDmesg: [  149.733266] ERROR @wl_cfg80211_get_tx_power : error (-1)
Date: Mon Feb 24 07:08:09 2014
LiveMediaBuild: Ubuntu 14.04 LTS "Trusty Tahr" - Alpha amd64+mac (20140218)
MachineType: Apple Inc. MacBookAir6,1
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: noprompt cdrom-detect/try-usb=true persistent 
file=/cdrom/preseed/username.seed boot=casper initrd=/casper/initrd.lz quiet 
splash -- maybe-ubiquity
RelatedPackageVersions:
 linux-restricted-modules-3.13.0-8-generic N/A
 linux-backports-modules-3.13.0-8-generic  N/A
 linux-firmware                            1.124
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 11/12/2013
dmi.bios.vendor: Apple Inc.
dmi.bios.version: MBA61.88Z.0099.B07.1311121319
dmi.board.asset.tag: Base Board Asset Tag#
dmi.board.name: Mac-35C1E88140C3E6CF
dmi.board.vendor: Apple Inc.
dmi.board.version: MacBookAir6,1
dmi.chassis.type: 10
dmi.chassis.vendor: Apple Inc.
dmi.chassis.version: Mac-35C1E88140C3E6CF
dmi.modalias: 
dmi:bvnAppleInc.:bvrMBA61.88Z.0099.B07.1311121319:bd11/12/2013:svnAppleInc.:pnMacBookAir6,1:pvr1.0:rvnAppleInc.:rnMac-35C1E88140C3E6CF:rvrMacBookAir6,1:cvnAppleInc.:ct10:cvrMac-35C1E88140C3E6CF:
dmi.product.name: MacBookAir6,1
dmi.product.version: 1.0
dmi.sys.vendor: Apple Inc.

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug third-party-packages trusty

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https://bugs.launchpad.net/bugs/1284085

Title:
  unable to boot after install on 2013 macbook air

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