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Thread: Chainloading Ubuntu from Grub Legacy

  1. #11
    Join Date
    Jul 2011
    Beans
    211

    Re: Chainloading Ubuntu from Grub Legacy

    Quote Originally Posted by Quackers View Post
    Or just not boot the entry for the missing system if you have more than one system and then re-install grub to the MBR from a booted OS to over-write the MBR.
    That will work if the missing system is NOT the controlling OS (i.e. the OS which last installed grub to the MBR). If the deleted system IS the controlling OS, then grub needs to be re-installed from another existing OS BEFORE deleting the controlling OS, otherwise the grub boot menu (grub.cfg) will no longer exist.

  2. #12
    Join Date
    Aug 2007
    Location
    a puddle in Manchester
    Beans
    9,204
    Distro
    Ubuntu 14.04 Trusty Tahr

    Re: Chainloading Ubuntu from Grub Legacy

    Yep, you're right there
    MacBook Pro 10,1 retina

  3. #13
    Join Date
    Apr 2012
    Beans
    12

    Re: Chainloading Ubuntu from Grub Legacy

    Thanks for all your responses. I made some progress. When I installed ubunutu I selected sdc (hd2) for the installation of the MBR. However in my grub configuration I was referencing sdc1 instead.

    So I changed my grub-legacy configuration to :
    Code:
    title Ubuntu Chainloader
    root (hd2)
    chainloader +1
    Which seems to work better but now I get the following error:

    Code:
    FileSystem Type Unknown, using whole disk
    Loading stage2Error found
    I might have messed up my grub2 configuration on sdc. Any suggestions on how I can restore grub on sdc.

    I also tried to configure my BIOS to boot directly off sdc however that also presented me with the blank screen.
    Last edited by lostinspace2011; April 17th, 2012 at 03:18 AM.

  4. #14
    Join Date
    Jun 2009
    Location
    SW Forida
    Beans
    Hidden!
    Distro
    Ubuntu 16.04 Xenial Xerus

    Re: Chainloading Ubuntu from Grub Legacy

    Chainloading from one drive to another quickly gets confusing. The boot drive is always hd0. So then the remaining drives start at hd1. Or sda is not always hd0. I boot sdb, so a chain load to sda is to hd1.

    I have copied my 40_custom from one install to another and had to edit chain loads as drive numbering changed. And if you plug a USB flash drive in it may change even more. I have had flash be sde or sdb, and I am not sure why.
    For more info on UEFI boot install & repair - Regularly Updated :
    http://ubuntuforums.org/showthread.php?t=2147295
    Please use Thread Tools above first post to change to [Solved] when/if answered completely.

  5. #15
    Join Date
    Apr 2012
    Beans
    12

    Re: Chainloading Ubuntu from Grub Legacy

    I am still in the same position where I am getting this error
    Code:
    FileSystem Type Unknown, using whole disk Loading stage2Error found
    I am connecting the external drive via SATA cable and the drive is always sdc / hd2.
    Any other suggestions to try out ?

  6. #16
    Join Date
    Jun 2009
    Location
    SW Forida
    Beans
    Hidden!
    Distro
    Ubuntu 16.04 Xenial Xerus

    Re: Chainloading Ubuntu from Grub Legacy

    Post boot info script results. This runs it and creates a link to the results.

    Boot Repair:
    https://help.ubuntu.com/community/Boot-Repair
    You can repair many boot issues with this or Create BootInfo report & post the link to a run of boot info script so we can see your exact configuration.
    For more info on UEFI boot install & repair - Regularly Updated :
    http://ubuntuforums.org/showthread.php?t=2147295
    Please use Thread Tools above first post to change to [Solved] when/if answered completely.

  7. #17
    Join Date
    Apr 2012
    Beans
    12

    Re: Chainloading Ubuntu from Grub Legacy

    Thanks. Boot-Repair fixed my problem

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