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:
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.
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
Operating System: BackTrack 5 R2 - Code Name
Revolution 64 bit
Boot files: /boot/grub/grub.cfg /etc/fstab /boot/grub/core.img
Here is the link to the thread on ubuntuforums:
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?