Ubuntu – How to fix dual-booting Windows 8 and Ubuntu 14.04 on a Sony Vaio

14.04dual-bootuefivaiowindows 8

I am currently trying to install Ubuntu 14.04 on a Sony Vaio that came pre-installed with Windows 8 in (I understand) UEFI mode. And I am experiencing the dual-boot hell. I already tried most of the suggestions in the exhaustive Installing Ubuntu Alongside a Pre-Installed Windows with UEFI guide as well as Ubuntu installations when using UEFI, but I still experience issues so please do NOT mark the current question as duplicate.

These are the steps that I already did:

  1. Use a 64-bit 14.04
  2. In the BIOS I could NOT find nor disable QuickBoot/FastBoot and Intel Smart Response Technology (SRT). But I did disable FastStartup in Windows 8.
  3. In BIOS I disabled SecureBoot.
  4. I installed 14.04 in UEFI mode (the /etc/fstab contains the UEFI partition) by using manual partitioning on the GPT hard-drive. I reduced the size of the Windows 8 partition from within Windows 8, as recommended.
  5. After the installation I noticed dual-booting issues, so attempted to use boot-repair (following this guide). But it only ended in an error and didn't fix much.


Windows 8 always boots fine. When somehow I manage to get to the grub screen then choosing Ubuntu or Windows 8 will result in either OS booting just fine. So dual-booting sort of works. However, most of the times the Vaio will simply boot to Windows 8 after a shutdown or restart.

To get to the grub screen reliably, I am currently using the following awkward workaround:

  • While holding the SHIFT key, I click on Restart within Windows-8:
    enter image description here
  • When the menu below appears, I select Use a device:
    enter image description here
  • Then I select Ubuntu:
    enter image description here

Afterwards the GRUB menu appears and I can boot Ubuntu. For this to work I had to enable External Device Boot in BIOS and set in the Boot priority that the External Device (1) should be before the Internal HDD (2).


  • How can I fix the dual-boot issues on the laptop? I would like to be able to get straight to the GRUB screen whenever I restart the computer, either from Windows 8 or from Ubuntu.

Best Answer

One Sony user posted this:

The trick was to manually copy the ubuntu Boot directory in place of the \EFI\Boot Directory, and rename shimx64.efi to \EFI\Boot\bootx64.efi (not \EFI\Microsoft\Boot\bootmgfw.efi )

Boot-Repairs fix is the rename of bootmgfw.efi, which has to be redone if Windows updates its files. And then can only boot Windows from grub menu.

Some other options:

Alternative to Boot-Repairs rename of shim. Some systems work better to register grub/shim from inside Windows - for those that keep resetting Windows as default

Grub not showing on startup for Windows 8.1 Ubuntu 13.10 Dual boot

bcdedit /set {bootmgr} path \EFI\ubuntu\grubx64.efi


Some install rEFInd which seems to be another workaround.