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tried grub update and boot-repair but none working. this is the link which boot repair gave me http://paste.ubuntu.com/10923998/

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Windows only boots from primary NTFS partitions with the boot flag. Since your install is in sda6 a logical partition, you cannot repair it directly to be bootable. You have to have a primary partition with bootmgr & BCD (and other files not normally shown in Summary repport).

You need to convert sda2 back to NTFS. It also shows some old DOS type boot files, so you must have converted it. But it has your bootmgr & BCD and boot flag, so it must have been your NTFS boot partition.

You may be able to use Disks or Disk Utility to just convert to NTFS or 07 type, but then may need to restore backup PBR or partition boot sector using testdisk. If you reformat be sure to first backup bootmgr, BCD & other Windows boot files.

Best to have a Windows repairCD or flash drive as then you can run those repairs.

And best to have Windows on primary partitions and Linux on the logical partitions. Linux does not care, but Windows really only likes primary NTFS partitions.

oldfred
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