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Thread: Ran boot-repair PC still doesn't boot

  1. #1
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    Oct 2012
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    Ran boot-repair PC still doesn't boot

    Mythbuntu 12.04 - I attempted to move one data drive to a different sata port, now the system doesn't boot (all drives are back to the original sata ports).

    I ran boot-repair (using 12.04 live CD, ran the recommended repair) No change, the system doesn't boot.

    I can boot the system off a rescue CD, choosing to boot off the correct boot drive. It then runs normally.

    From boot-repair: http://paste.ubuntu.com/1272150/

    boot-repair reports:
    "The boot files of [Ubuntu 12.04.1 LTS] are far from the start of the disk"

    Do I have to create a new boot partition (at the start of the disk) to resolve this?

    Thanks

  2. #2
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    Re: Ran boot-repair PC still doesn't boot

    How bout this as only required to re-install grub:
    If Ubuntu is operating normally, boot into the working installation and run the following command from a terminal.

    • X is the drive (letter) on which you want GRUB to write the boot information. Normally users should not include a partition number, which would produce an error message as the command would attempt to write the information to a partition.
      sudo grub-install /dev/sdX # Example: sudo grub-install /dev/sda

    This will rewrite the MBR information to point to the current installation and rewrite some GRUB 2 files (which are already working). Since it isn't done during execution of the previous command, running sudo update-grub after the install will ensure GRUB 2's menu is up-to-date.

    https://help.ubuntu.com/community/Grub2/Installing

    Links on this howto for additional help. Post back if additional help needed.

    regards <==BDQ


  3. #3
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    Re: Ran boot-repair PC still doesn't boot

    We seem to be seeing this type of issue on very large / (root) partitions. Yann in Boot repair highlights it and one solution is a separate small /boot within the first 100GB.

    But I normally install with the entire / in a 25GB partition and have not had any real issues. It also may be related to BIOS issues but we cannot seem to tell. Is BIOS in AHCI, IDE, or LBA or large or whatever your BIOS may call it. If IDE it may be emulating the old IDE drives that can only boot from the first 137GB of a drive.

    I have often suggested just shrinking / to 100GB or less and for many that seems to have worked. You can then use rest of drive as /home or for data partitions.
    Code:
    =================== sdb1: Location of files loaded by Grub: ====================
    
               GiB - GB             File                                 Fragment(s)
    
     872.167018890 = 936.482205696  boot/grub/core.img                             1
     872.186882019 = 936.503533568  boot/grub/grub.cfg                             1
       0.907226562 = 0.974127104    boot/initrd.img-3.2.0-23-generic               2
       1.875976562 = 2.014314496    boot/initrd.img-3.2.0-29-generic               2
       9.555664062 = 10.260316160   boot/initrd.img-3.2.0-30-generic               2
      10.157226562 = 10.906238976   boot/initrd.img-3.2.0-31-generic               2
    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
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    Re: Ran boot-repair PC still doesn't boot

    Update - no progress so far.

    BIOS is set to use AHCI

    I shrunk sdb1 to 99 GB, then ran boot-repair. No luck. Tried boot-repair again selecting "ATA disk support (solves the [out of disk] error)" - ouch that made it worse. Grub couldn't see the drive. Recovered back to where the system will boot if I boot using the System Rescue CD.

    With the system running tried (no errors reported by grub):
    update-grub
    grub-install /dev/sdb
    grub-install --recheck /dev/sdb

    I still see the same issue: stuck at a flashing curser at boot
    The last Boot repair run: http://paste.ubuntu.com/1274025

  5. #5
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    Re: Ran boot-repair PC still doesn't boot

    Script now looks normal to me. All boot files are close together.

    There was another thread where the user could not boot because of an issue on another drive. I do believe grub still scans drives on a boot. And issues on other drives may be a problem.

    Since you have xfs as the format of the other drives, I wonder if grub has an issue?

    This is just an experiment on my part.
    I might try adding the xfs.mod file to the grub configuration even though grub should not need it.

    mount /dev/sdb1 /mnt
    gksu gedit /mnt/boot/grub/grub.cfg
    #May have to do this first as it is write protected also:
    sudo chmod +w /mnt/boot/grub/grub.cfg
    #Or even this first:
    sudo chmod 777 /mnt/boot/grub/grub.cfg

    at line 161 you have this:
    insmod ext2
    #add this just before or after
    insmod xfs

    My hope is that the search then may work.

    Another alternative is just add a # before all the search lines.

    Grub uses the set root line to know what drive, partition to use, but if drive order
    has changed uses the search to correct it. If it cannot search the xfs the search fails.

    set root='(hd1,msdos1)'
    search --no-floppy --fs-uuid --set=root b91a2f25-fd72-46dd-8e8f-c6018bca78bb

    If you are using BIOS to boot from sdb the above entry also should be hd0. Boot drive in BIOS is always hd0. Search then should correct it but again if it cannot search xfs it fails.

    Another way to boot. This can bypass grub.
    http://www.supergrubdisk.org/
    http://www.supergrubdisk.org/wiki/Main_Page
    Last edited by oldfred; October 12th, 2012 at 04:58 AM.
    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.







  6. #6
    Join Date
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    Re: Ran boot-repair PC still doesn't boot

    hi
    Quote Originally Posted by ngahiker View Post
    selecting "ATA disk support (solves the [out of disk] error)" - ouch that made it worse.
    for information, this option can easily be reverted by using B-R again without this option. Now you don't use it any more, so don't worry about it.

    The BootInfo seems ok to me. Sorry i can't help on this. Please follow Oldfred's advice.

  7. #7
    Join Date
    Oct 2012
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    Re: Ran boot-repair PC still doesn't boot

    XFS issue - interesting - I tried a quick test. Booted the PC with just the ext4 boot drive connected. PC booted normally.

    update-grub
    grub-install /dev/sda
    grub-install --recheck /dev/sda

    Shut down PC then plugged in the two xfs drives.

    PC rebooted normally.

    Ran boot-repair (just create a boot info summary option) http://paste.ubuntu.com/1275971

    Sounds like I was lucky it ever booted...

  8. #8
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    Re: Ran boot-repair PC still doesn't boot

    So it now works? Very strange.

    I still think the original issue somehow related to the xfs drives but then issue should have reappeared when you reinstalled those drives. Computers are always so consistent.
    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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