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Thread: Cannot chainload BT5-Partition

  1. #1
    Just burned his ISO
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    Mar 2012
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    5

    Default Cannot chainload BT5-Partition

    Hi,

    This is a repost as my previous thread didnt seem to go through (been more than 24hours):
    I am using BackTrack5 R2 and installed it to a logical partition.
    On this system I chainload all partitions from an extlinux boot partition which simply does a "COM32 chain.c32 and APPEND hd0 10" (in similar manner for each of the OS's running on that computer)
    While all other Ubuntu installations (Version 11.10) and even non-ubuntu work just fine with this, BackTrack seems to have a problem with this.

    The message I get after the chainload to the BackTrack-partition has been done is "Boot sector signature not found (unbootable disk/partition?)"
    I have tried fresh installs of the 32 and 64bit variant of BT5 R2 but both have this problem, I have also tried boot-repair (doing a fresh install of grub2, etc.) from a live-cd, also without success.
    Boot-repair runs successfully but afterwards you get this in the report:
    Code:
    sda10: _________________________________________________________________________
    
        File system:       ext4
        Boot sector type:  Grub2 (v1.99)
        Boot sector info:  Grub2 (v1.99) is installed in the boot sector of 
                           sda10 and looks at sector 1 of the same hard drive for 
                           core.img, but core.img can not be found at this 
                           location.
        Operating System:  BackTrack 5 R2 - Code Name 
                           Revolution 64 bit
        Boot files:        /boot/grub/grub.cfg /etc/fstab /boot/grub/core.img
    I have already posted this in the ubuntuforums but as this problem is only with BT I thought I might give it a try here.
    Here is the link to the thread on ubuntuforums:
    http://ubuntuforums.org/showthread.php?t=1944906&page=3

    The weird thing is, if I activate os-probing on one of the other Ubuntus, it detects BackTrack as Ubuntu and puts it into the menu, booting it from there works fine!
    However I don't want to boot from the main menu to one partition only to get the boot menu there (which I would usually disable) and then boot into BackTrack...

    Can anyone help me with this problem?
    If more info is needed I will gladly provide it if you tell me how and what.
    I really tried googling for this problem and searching the forums but was unable to find a solution.

    PS: writing a boot sector into the partition from a different OS seems to work fine but it obviously also redirects me to the grub menu of the other OS, it seems that I cannot create a bootable partition with backtrack without also writing into the mbr?

    Thanks.

  2. #2
    Just burned his ISO
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    Mar 2012
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    Default Re: Cannot chainload BT5-Partition

    is there maybe a way to replace grub 1.98 from BackTrack with Grub1.99?

  3. #3
    Just burned his ISO
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    Mar 2012
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    Default Re: Cannot chainload BT5-Partition

    Hi,

    can anybody confirm this or anyone found a solution to this?

  4. #4
    Just burned his ISO
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    Mar 2012
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    Default Re: Cannot chainload BT5-Partition

    does someone maybe know how I can replace grub with extlinux on backtrack as it does not seem to be in the repositories...

  5. #5
    Just burned his ISO
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    Default Re: Cannot chainload BT5-Partition

    Would anyone be able to help with this? It still does not work with BackTrack5 R3
    I either need a newer version of grub (Oneiric Ocelot and Precise Pangolin run just fine chainloading their grub) or extlinux (the installed syslinux is too old and does not seem to support ext4).

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