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I have 2 partitions sda1 XP and sda2 CENTOS. I have reinstalled grub on /dev/sda but on rebooting, I experienced: error : 22 no such parition for Centos; while Windows boots charmingly on the other.

fdisk -l gives sda1 as boot, is there a possibility that I can change it to sda2 on shell, since I am on rescue mode.

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is there a possibility that I can change it to sda2

fdisk utility itself has an option to toggle the boot partition.

fdisk /dev/sda

type 'a' to toggle the bootable flag

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  • failed to read image. and replicates error:22
    – Corleone
    Jul 30 '14 at 11:54
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sudo fdisk /dev/sda

Command (m for help): m
   Command action
   a   toggle a bootable flag
   b   edit bsd disklabel
   c   toggle the DOS compatibility flag
   d   delete a partition
   l   list known partition types
   m   print this menu
   n   add a new partition
   o   create a new empty DOS partition table
   p   print the partition table
   q   quit without saving changes
   s   create a new empty Sun disklabel
   t   change a partition's system id
   u   change display/entry units
   v   verify the partition table
   w   write table to disk and exit
   x   extra functionality (experts only)

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