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Thread: can't boot ubuntu after windows 7 installation efi

  1. #1
    Join Date
    Apr 2009
    Location
    Greece-Chania
    Beans
    7
    Distro
    Ubuntu 11.04 Natty Narwhal

    can't boot ubuntu after windows 7 installation efi

    Hey there,just installed win7 uefi to my system.Then i used boot-repair(one click repair ) to restore grub menu.but when i try to boot ubuntu (13.04) i end up with black screen.Windows boot just fine.
    secure boot is disabled.Ubuntu were uefi installed.
    http://paste.ubuntu.com/6200368/
    here is boot-repair review.

    What i did is not so smart since i havent really fully understand mbr vs gtp grub etc

  2. #2
    Join Date
    Jun 2009
    Location
    Chicago Suburbs
    Beans
    Hidden!
    Distro
    Ubuntu 14.04 Trusty Tahr

    Re: can't boot ubuntu after windows 7 installation efi

    You did run the rename which may or may not be required. I think Boot-Repair suggests that fix for some systems that do not need it, but that is not related to your main issue. Line 977 in your report:
    Save and rename /mnt/boot-sav/sdb3/boot/efi/EFI/Boot/bootx64.efi (/mnt/boot-sav/sdb3/boot/efi/EFI/Boot/bkpbootx64.efi)

    If you want to undo that.

    To undo & to rename files to their original names, you just need to tick the "Restore EFI backups" option of Boot-Repair.

    If you are not booting Ubuntu that may be a video issue. If you get grub menu have you tried nomodeset.
    What video card/chip do you have for video?
    I have to add nomodeset with my nVidia. At grub menu press e for edit, scroll to linux line and replace the quiet splash with nomodeset.

    How to set NOMODESET and other kernel boot options in grub2 - both BIOS liveCD & grub first boot ( also UEFI with grub)
    http://ubuntuforums.org/showthread.php?t=1613132
    https://help.ubuntu.com/community/BootOptions


    Graphics Resolution- Upgrade /Blank Screen after reboot mega thread - MAFoElffen
    http://ubuntuforums.org/showthread.php?t=1743535
    Editing the GRUB 2 Menu During Boot
    https://help.ubuntu.com/community/Grub2/Troubleshooting

    http://askubuntu.com/questions/162075/my-computer-boots-to-a-black-screen-what-options-do-i-have-to-fix-it




    For info on UEFI boot install & repair - Updated Mar 2015:
    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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