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Thread: WinBoot and Grub

  1. #1
    Join Date
    Jun 2010
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    Baltimore, Maryland, Unit
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    Distro
    Ubuntu 10.10 Maverick Meerkat

    WinBoot and Grub

    So, I just got my tablet back from hp tech, and (<sarcastic>who could have guessed?</sarcastic>) they formatted me. So, I want to install Lucid again (not maverick yet- I want to just do a check on any bugs in lucid first) and use grub but have the option to switch back to Win BCD in the future. I used the command "sudo dd if=/dev/sda1 of=mbr.backup bs=512 count=1" and it was successful. Is that correct for backup of the bcd? How would I switch back to win bcd from grub in the future? Also, is it normal for wireless not to work in live env.? If so, I'll install maverick.

    Thanks!

  2. #2
    Join Date
    Jun 2009
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    Chicago Suburbs
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    Ubuntu 14.04 Trusty Tahr

    Re: WinBoot and Grub

    You should not have to copy the partition boot sector for windows as grub should not overwrite it. Grub does overwrite the MBR, but it is not difficult to reinstall windows boot loader or lilo boot loader as all the MBR windows style boot loaders do is look at the partition table for the active partition (boot flag) and jump to that boot sector to continue booting. When grub boots windows it skips the MBR and just jumps to the partition boot sector to boot windows.

    I was able to download the windows repair and copy it to a USB to be able to repair windows. I did not have win7 so I copied the repair CD to a CD and used it to copy itself to the USB.

    If your PC did not come with a complete Vista or Win7 installation CD, you can download a Recovery Disc at the following links:
    Windows Vista/7 Recovery Disc - for repairs only
    http://neosmart.net/blog/2008/window...disc-download/
    http://neosmart.net/blog/2009/window...-repair-discs/
    Vista will not repair XP (they create the boot sectors differently) but can run chkdsk.
    http://support.microsoft.com/kb/927392
    Oldfred on vacation. Back Sept 9. Will not have much if any Internet access.
    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
    Join Date
    Jun 2010
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    Re: WinBoot and Grub

    I don't want to have to repair Windows, I just want to be able to set Windows BCD as default (with an "Ubuntu" option that links to grub) using command lines-whether it be in terminal or cmd- AFTER install. I set Windows BCD as default on my desktop right after install, and the program EasyBCD allows you to add entries to the BCD. If grub is default, does the option "Windows Vista Loader" boot windows or bring up the boot loader? If I have grub as default, how would I switch back to BCD as default with a "Windows" option and an "Ubuntu" option (that actually brings up grub, not ubuntu)? Would I install grub to the ubuntu partition during install to prevent the overwriting of Windows BCD?
    Last edited by tcopeland; August 8th, 2010 at 10:41 PM.

  4. #4
    Join Date
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    Chicago Suburbs
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    Ubuntu 14.04 Trusty Tahr

    Re: WinBoot and Grub

    Understand that with easybcd you have to install grub2 to the Ubuntu partition and make a copy of that to boot. But grub2 is not considered by grub to be reliable as it has to use blocklists. Block lists as I understand are hard coded addresses, so if a file is moved on the hard drive by partitioning, updates or even filechks you will have to reinstall grub to make it work. It will work in the beginning but who knows down the road what may change. Grub2 will reliably boot windows. It is not difficult to reinstall a windows boot loader to the MBR.

    How to restore the Ubuntu/XP/Vista/7 bootloader (Updated for Ubuntu 9.10)
    http://ubuntuforums.org/showthread.php?t=1014708
    Oldfred on vacation. Back Sept 9. Will not have much if any Internet access.
    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
    Join Date
    Jun 2010
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    Ubuntu 10.10 Maverick Meerkat

    Re: WinBoot and Grub

    So reinstalling Windows BL DOES NOT require reinstalling windows? It's not like restore?

  6. #6
    Join Date
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    Chicago Suburbs
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    Ubuntu 14.04 Trusty Tahr

    Re: WinBoot and Grub

    Many but not all windows repairs can be done from linux. That is why many repairCDs are linux based.

    Restore basic windows boot loader - universe enabled from Ubuntu or liveCD
    sudo apt-get install lilo
    sudo lilo -M /dev/sda mbr
    May show error messages about the rest of lilo missing, ignore, we just want MBR
    You also can use linux's testdisk to recover a corrupt boot sector from its backup in windows.

    From windows repair CD:
    In XP
    fixMBR
    fixBoot
    in Vista or 7
    BootRec.exe /fixmbr #updates MBR master boot record do not run if you still want grub
    chkdsk C: /r /f (may have to run /r or /f as separate entries) rerun until no errors
    BootRec.exe /FixBoot #updates PBR partition boot sector
    Oldfred on vacation. Back Sept 9. Will not have much if any Internet access.
    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.







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