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Thread: dual boot breaks after replacing XP with Windows 7

  1. #1
    Join Date
    Nov 2011
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    2

    dual boot breaks after replacing XP with Windows 7

    I used to have windows xp on my first partition and ubuntu on my second. dual boot used to work fine with that configuration. a boot menu used to appear to select windows xp or ubuntu.

    But, today I decided to replace xp with windows 7. So I inserted win7 DVD and reboot the computer with it. Formatted my first partition and installed windows 7.
    Now, only the windows 7 boots, and no multiboot menu. the multiboot menu is gone.
    I can still see the second partition in Windows 7( but not the files, only the space assigned to it), but I can not boot the unbuntu.
    Please help.

  2. #2
    Join Date
    Mar 2010
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    32

    Re: dual boot breaks after replacing XP with Windows 7

    Windows overwrites the bootloader that was installed when you installed ubuntu (so your ubuntu install is perfectly fine, no worries there). If you still have the ubuntu live CD you can reinstall grub, though I forget exactly how to do that...

  3. #3
    Join Date
    Jun 2009
    Location
    Chicago Suburbs
    Beans
    Hidden!
    Distro
    Ubuntu 14.04 Trusty Tahr

    Re: dual boot breaks after replacing XP with Windows 7

    These have the commands to use.

    How to restore the Ubuntu/XP/Vista/7 bootloader (Updated for Ubuntu 9.10)
    http://ubuntuforums.org/showthread.php?t=1014708
    https://help.ubuntu.com/community/Gr...0from%20LiveCD

    #Comments are anything after the #, enter commands in terminal session
    #Install MBR from LiveCD/usb, Ubuntu install on sda5 and want grub2's bootloader in drive sda's MBR:
    #Find linux partition, change sda5 if not correct:
    sudo fdisk -l
    #confirm that linux is sda5
    sudo mount /dev/sda5 /mnt
    sudo grub-install --root-directory=/mnt/ /dev/sda
    #If grub 1.99 with Natty uses boot not root.
    sudo grub-install --boot-directory=/mnt/boot /dev/sda

    # If no errors on previous commands reboot into working system and run this:
    sudo update-grub
    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.







  4. #4
    Join Date
    Nov 2011
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    2

    Re: dual boot breaks after replacing XP with Windows 7

    Quote Originally Posted by mjzanga View Post
    Windows overwrites the bootloader that was installed when you installed ubuntu (so your ubuntu install is perfectly fine, no worries there). If you still have the ubuntu live CD you can reinstall grub, though I forget exactly how to do that...
    Thank you for your reply. Is Live CD the same as installation CD that I have to dowenload from here?:
    http://www.ubuntu.com/download/ubuntu/download

  5. #5
    Join Date
    Nov 2009
    Location
    Segur De Calafell, Spain
    Beans
    11,660
    Distro
    Ubuntu 12.04 Precise Pangolin

    Re: dual boot breaks after replacing XP with Windows 7

    Live CD is the standard Desktop CD. It's called like that because if you select Try Ubuntu in the main menu it will load it from the cd not touching the hdd. Then you can open terminal and run the commands oldfred posted. That will reinstall grub to the MBR.
    Darko.
    -----------------------------------------------------------------------
    Ubuntu 12.04 LTS 64bit & Windows 7 Ultimate 64bit

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