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Thread: ubuntu 13.04 x64/windows 8 x64 dual boot

  1. #1
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    ubuntu 13.04 x64/windows 8 x64 dual boot

    i have a uefi bios motherboard.
    for the installation of ubuntu 12.10 i made a mbr partition
    now if i install 13.04 inin the same mbr partition i will have problem with windows 8 dual boot ?
    or i must reconfigure the partition to gpt for the installation of ubuntu 13.04?
    Last edited by gmathiou4; April 25th, 2013 at 04:18 PM.

  2. #2
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    Ubuntu 14.04 Trusty Tahr

    Re: ubuntu 13.04 x64/windows 8 x64 dual boot

    If you are installing your own system, you can stay with MBR.

    The issue is that for ease of dual booting both systems need to be either UEFI or both BIOS/Legacy/CSM boot mode. You can boot if different, but have to change UEFI/BIOS boot mode each time.

    And Windows only boots from gpt drives with UEFI or only UEFI from gpt drives.
    Ubuntu will boot from gpt drives with BIOS or UEFI.
    If MBR(msdos) you have to use BIOS mode to boot.

    I would think it best just to stay with MBR, unless you do want to totally backup data, reformat and reinstall.
    There are tools to convert a MBR drive to gpt, but if a bootable drive it will require a lot of reconfiguration or just about a new install anyway. I would only consider conversion on data only drive.
    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.







  3. #3
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    Re: ubuntu 13.04 x64/windows 8 x64 dual boot

    i have no problem with clean install...
    so the best solution is to make the both partition gpt and reinstall ubuntu and windows with uefi mode?
    Last edited by gmathiou4; May 16th, 2013 at 04:19 PM.

  4. #4
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    Re: ubuntu 13.04 x64/windows 8 x64 dual boot

    MBR & gpt are partitioning types or how the partitions are defined on the drive. You only have to have gpt if you have a drive or 2TB or if you want to boot with UEFI.

    MBR details including 2TiB limit and GPT link
    http://en.wikipedia.org/wiki/Master_boot_record

    GPT Advantages (older but still valid) srs5694 post #2:
    http://ubuntuforums.org/showthread.php?t=1457901
    GPT or MBR
    http://ubuntuforums.org/showthread.php?t=1625285

    But Windows will not install in UEFI boot mode from DVD.

    Microsoft suggested partitions including reserved partition for gpt & UEFI:
    http://technet.microsoft.com/en-us/l...8WS.10%29.aspx
    Older Windows info on gpt - 2008 updated 2011
    http://msdn.microsoft.com/en-us/wind.../gg463525.aspx

    You cannot use the Win7 DVD in UEFI mode, you need to use BIOS mode or modify to USB with UEFI.
    Install Windows efi to new drive.
    http://technet.microsoft.com/en-us/l...=ws.10%29.aspx
    https://gitorious.org/tianocore_uefi..._UEFI_boot_USB
    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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