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Thread: Dual boot Ubuntu and Windows 8 UEFI Mode

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  1. #1
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    Dual boot Ubuntu and Windows 8 UEFI Mode

    Hi,

    I install Ubuntu 12.10 amd64 in ultrabook samsung series 5 with HDD and SDD, and It have Windows 8 pre-installed, when I installed Ubuntu the grub didn't work, then I used boot-recovery to fix it, but windows 8 entry do not work.

    http://paste.ubuntu.com/5654012/

    Thanks.

  2. #2
    Join Date
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    Chicago Suburbs
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    Ubuntu 14.04 Trusty Tahr

    Re: Dual boot Ubuntu and Windows 8 UEFI Mode

    Do you have secure boot on. Some systems work with it on or off, others only boot Windows with it on.

    You have the Intel SRT, did you turn that off and now have you turned it on?

    Some others with Samsungs
    Samsung Ultrabook Windows 8 & Ubuntu & recovery boot Disk view of partitions
    http://ubuntuforums.org/showthread.php?t=2097690
    Samsung Series 7 - post #5 Windows 8 & UEFI, Ubuntu only to new SSD
    http://ubuntuforums.org/showthread.php?p=12382951
    SAMSUNG Series 3 NP365E5C-XXXXX laptops
    http://ubuntuforums.org/showthread.php?t=2120763
    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: Dual boot Ubuntu and Windows 8 UEFI Mode

    Quote Originally Posted by oldfred View Post
    Do you have secure boot on. Some systems work with it on or off, others only boot Windows with it on.

    You have the Intel SRT, did you turn that off and now have you turned it on?

    Some others with Samsungs
    Samsung Ultrabook Windows 8 & Ubuntu & recovery boot Disk view of partitions
    http://ubuntuforums.org/showthread.php?t=2097690
    Samsung Series 7 - post #5 Windows 8 & UEFI, Ubuntu only to new SSD
    http://ubuntuforums.org/showthread.php?p=12382951
    SAMSUNG Series 3 NP365E5C-XXXXX laptops
    http://ubuntuforums.org/showthread.php?t=2120763
    Yes, my secure boot on and Intel SRT on too, I didn't turn off it.
    I read the threads, but nothing work here.
    Have you something else?

  4. #4
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    Re: Dual boot Ubuntu and Windows 8 UEFI Mode

    From UEFI menu can you directly boot Windows?

    It does not look like Boot-Repair has renamed the Windows boot file, unless you reran Boot-Repair. Some systems only boot Windows efi file. So Boot-Repair has to rename Windows or you can un-rename it and should have the original Windows file. May have to try with secure boot both on and off. Many seem to only be able to boot Windows with secure boot on.

    Boot-Repair - Updated Jan 1, 2013 to not rename first time, but rename if first time Windows does not boot. Post 706 and 711
    http://ubuntuforums.org/showthread.p...769482&page=71
    Boot-Repair copied /EFI/ubuntu/grubx64.efi to /EFI/Boot/bootx64.efi (in case the BIOS is hard-coded to boot into /EFI/Boot/bootx64.efi or secure boot signed GRUB file shimx64.efi.
    A user disabled secure boot, and unchecked it in boot-repair. It now bypasses Grub and goes straight in to Windows.
    Renamed files:
    /EFI/Boot/bkpbootx64.efi
    /EFI/Microsoft/Boot/bkpbootmgfw.efi

    To perform this, just run Boot-Repair --> Adv options --> tick "Backup and rename EFI files" --> Apply
    Then reboot the PC to UEFI/BIOS and chose ubuntu, and please tell us what you observe.
    Please enable SecureBoot in your BIOS, then run Boot-Repair --> Advanced Options --> "GRUB options" tab --> tick "SecureBoot" --> Apply.
    To undo & to rename files to their original names, you just need to tick the "Restore EFI backups" option of Boot-Repair.
    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.







  5. #5
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    Re: Dual boot Ubuntu and Windows 8 UEFI Mode

    Quote Originally Posted by oldfred View Post
    From UEFI menu can you directly boot Windows?
    When I press F10 in boot appears a menu boot with the options ubuntu and Windows bootloader, if a choose ubuntu then appears the grub, if a choose Windows bootloader then I boot windows 8.
    Quote Originally Posted by oldfred View Post
    It does not look like Boot-Repair has renamed the Windows boot file, unless you reran Boot-Repair. Some systems only boot Windows efi file. So Boot-Repair has to rename Windows or you can un-rename it and should have the original Windows file. May have to try with secure boot both on and off. Many seem to only be able to boot Windows with secure boot on.
    If a turn off secure boot the entry in grub work, but the entry don't work with boot secure on. Then is it impossible work with boot secure on?

    Quote Originally Posted by oldfred View Post
    Boot-Repair - Updated Jan 1, 2013 to not rename first time, but rename if first time Windows does not boot. Post 706 and 711
    http://ubuntuforums.org/showthread.p...769482&page=71
    Boot-Repair copied /EFI/ubuntu/grubx64.efi to /EFI/Boot/bootx64.efi (in case the BIOS is hard-coded to boot into /EFI/Boot/bootx64.efi or secure boot signed GRUB file shimx64.efi.
    A user disabled secure boot, and unchecked it in boot-repair. It now bypasses Grub and goes straight in to Windows.
    Renamed files:
    /EFI/Boot/bkpbootx64.efi
    /EFI/Microsoft/Boot/bkpbootmgfw.efi

    To perform this, just run Boot-Repair --> Adv options --> tick "Backup and rename EFI files" --> Apply
    Then reboot the PC to UEFI/BIOS and chose ubuntu, and please tell us what you observe.
    Please enable SecureBoot in your BIOS, then run Boot-Repair --> Advanced Options --> "GRUB options" tab --> tick "SecureBoot" --> Apply.
    To undo & to rename files to their original names, you just need to tick the "Restore EFI backups" option of Boot-Repair.

  6. #6
    Join Date
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    Chicago Suburbs
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    Re: Dual boot Ubuntu and Windows 8 UEFI Mode

    Does Windows 8 boot with secure boot both on and off?

    Ubuntu only boots with secure boot off? Ubuntu uses the Microsoft UEFI secure boot key to boot, so it still should boot if you are using the shim efi file as that is the version with the key.

    But some systems need the files renamed as they only boot the Windows efi file with secure boot. Then you can use Boot-Repair (rename files in advanced options posted above) to rename shim to the Windows file & both should boot with secure boot on.
    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.







  7. #7
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    Mar 2013
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    Re: Dual boot Ubuntu and Windows 8 UEFI Mode

    Quote Originally Posted by oldfred View Post
    Does Windows 8 boot with secure boot both on and off?

    Ubuntu only boots with secure boot off? Ubuntu uses the Microsoft UEFI secure boot key to boot, so it still should boot if you are using the shim efi file as that is the version with the key.

    But some systems need the files renamed as they only boot the Windows efi file with secure boot. Then you can use Boot-Repair (rename files in advanced options posted above) to rename shim to the Windows file & both should boot with secure boot on.
    I boot windows 8 by grub with secure boot off. I can boot windows with secure boot on when a press F10 for boot Menu.
    I don't know if I did it it correctly:

    Quote Originally Posted by oldfred View Post
    A user disabled secure boot, and unchecked it in boot-repair. It now bypasses Grub and goes straight in to Windows.
    It's OK, I can do it.
    Quote Originally Posted by oldfred View Post
    Renamed files:
    /EFI/Boot/bkpbootx64.efi
    /EFI/Microsoft/Boot/bkpbootmgfw.efi

    To perform this, just run Boot-Repair --> Adv options --> tick "Backup and rename EFI files" --> Apply
    Then reboot the PC to UEFI/BIOS and chose ubuntu, and please tell us what you observe.
    Please enable SecureBoot in your BIOS, then run Boot-Repair --> Advanced Options --> "GRUB options" tab --> tick "SecureBoot" --> Apply.
    To undo & to rename files to their original names, you just need to tick the "Restore EFI backups" option of Boot-Repair.
    I can't find this files, then I used liveCD for recovery the grub.

  8. #8
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    Re: Dual boot Ubuntu and Windows 8 UEFI Mode

    Another user who did not want Windows, so he erased it.

    http://ubuntuforums.org/showthread.php?t=2129858
    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.







  9. #9
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    Re: Dual boot Ubuntu and Windows 8 UEFI Mode

    So can you boot from grub both Ubuntu & Windows with secure boot off? Then I would just leave it and use it that way. Or do both work with secure boot on when booting grub to grub menu, then from grub menu boot Windows?

    http://www.zdnet.com/torvalds-clarif...on-7000011918/
    the whole UEFI thing is more about control than security
    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.







  10. #10
    Join Date
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    Re: Dual boot Ubuntu and Windows 8 UEFI Mode

    OK, I will use it.
    Maybe the next version fix it

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