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Thread: Can't dual boot Ubuntu 12.04.2 with windows 8 on Grub

  1. #1
    Join Date
    Apr 2013
    Beans
    1

    Can't dual boot Ubuntu 12.04.2 with windows 8 on Grub

    Hi,

    I'm trying to install dual boot (Windows 8 and Ubuntu 12.04.2) using UEFI. Followed the instructions on https://help.ubuntu.com/community/UE...DD_in_EFI_mode, but the only way to get both Ubuntu and Windows working is modifying the boot option Priority in the Aptio Setup Utility.

    If the Boot Option Priority is ubuntu (the other option would be Windows Boot Manager, that goes straight to windows 8), the computer goes to grub, and ubuntu the SO starts without problem. If the windows loader option is selected, the following error occurs:

    ERROR: unknown command "DRIVEMAP'
    ERROR: Invalid EFI filepath

    this error was also occuring also before i ran the Boot-Repair api.

    this is my Boot-Repair output:
    http://paste.ubuntu.com/5667865/

  2. #2
    Join Date
    Jun 2009
    Location
    Chicago Suburbs
    Beans
    Hidden!
    Distro
    Ubuntu 12.04 Precise Pangolin

    Re: Can't dual boot Ubuntu 12.04.2 with windows 8 on Grub

    Grub2's os-prober has a bug. And normally Boot-Repair adds corrected entries into 25_custom, but I do not see them???

    grub2's os-prober creates wrong style (BIOS) chain boot entry
    https://bugs.launchpad.net/ubuntu/+s...2/+bug/1024383
    type of entry from Boot-Repair that should work.
    'Windows UEFI loader'
    Type of entry that does not work:
    'Windows ...) (on /dev/sdXY)'

    Both bug report and this thread have examples, it you have to add an entry manually:
    http://ubuntuforums.org/showthread.php?t=2085530
    For info on UEFI boot install & repair:
    http://ubuntuforums.org/showthread.php?t=2147295
    Please use Thread Tools above first post to close thread when/if answered completely.







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