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Thread: Dualboot with Windows 8 UEFI

  1. #1
    Join Date
    Mar 2013

    Dualboot with Windows 8 UEFI

    When install Ubuntu and dual boot with windows 8, is it better to share the EFI partition that Windows 8 have or is it better creating one for Ubuntu too? Having two EFI partitions?

    I can´t get it to work, Ubuntu boots but not Windows 8, I have two EFI partitions. I have tried the Ubuntu boot rescue disk but it does not work either


    I installed Arch instead followed this tutorial.
    Last edited by amandus; April 2nd, 2013 at 12:53 PM.

  2. #2
    Join Date
    Jun 2009
    SW Forida
    Ubuntu 16.04 Xenial Xerus

    Re: Dualboot with Windows 8 UEFI

    You only can have one efi partition per hard drive. Your link is for two hard drive install.

    If you boot Ubuntu in UEFI mode it will install grub2's efi boot files into the existing efi partition, in a separate ubuntu folder. With two drives you should install grub'2 efi files to the same hard drive as the Ubuntu install and then modify the chain load to Windows to see the other efi partition on the Windows drive.
    For more info on UEFI boot install & repair - Regularly Updated :
    Please use Thread Tools above first post to change to [Solved] when/if answered completely.

  3. #3
    Join Date
    Mar 2013

    Re: Dualboot with Windows 8 UEFI

    I modified the tutorial for my needs, using sda disk instead and ordinary partitions.


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