So that's definitely a legacy bios installation, which really isn't recommended anymore for most systems because EFI boot usually works fine and exposes more functionality.
I'd at least like to confirm that booting in native EFI works without nr_cpus=1. You should be able to just run 'sudo apt-get install grub- efi', then when you reboot rEFInd will have an option that's labeled something like "Boot EFI\ubuntu\grub64.efi". Use that one, remove nr_cpus=1, and let us know what happens. Note that this will remove grub-pc, but it doesn't actually erase grub so you should still be able to boot back to the legacy mode if something goes wrong. I'm also curious whether you're intentionally doing the legacy bios install. If not, how exactly are you flashing the iso and starting the installer? The only way I can get that is to select the "Boot Legacy OS from HD" option to start the installer. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1284085 Title: unable to boot after install on 2013 macbook air Status in Release Notes for Ubuntu: New Status in “linux” package in Ubuntu: Confirmed Bug description: 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. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-release-notes/+bug/1284085/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
