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It is showing just two options, one is Ubuntu and second is Advance Options.

First, it was not even showing me the grub menu, I was booting directly into the Ubuntu. After reading some answers, I installed update-grub. And reinstalled it. Now grub menu is showing successfully but still, I can't see windows 7 option in grub menu.

I want to use both Windows and Linux, how can I use my system in dual mode or how can I bring windows 7 option in grub boot menu?

I have installed boot-repair and did everything as it directs me. Nothing happened.

I have read many of the answers everyone suggesting either update-grub or boot-repair. I've did both

Output of fdisk -l

enter image description here

  • This is not a full answer, however I have had success in the past using a tool called grub customizer to add windows installations back to the grub menu. It can be found on this PPA. – M. Bromilow Aug 6 '17 at 13:42
  • I have downloaded and opened it, but how can I mention windows 7 OS in it? – Siraj Aug 6 '17 at 13:47
  • It looks like one of those NTFS partitions is your windows 7 installation, so you would add an "Other" operating system and enter a Boot Sequence like the one inside this answer, replacing the drive with something like (hd0,msdos3). – M. Bromilow Aug 6 '17 at 13:53
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    Have you reviewed Windows 8 doesn't dual boot doesn't show on grub menu? It seems to have the most trusted answers. Also most duplicate questions are closed to this link. – WinEunuuchs2Unix Aug 6 '17 at 13:55
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    Your fdisk says you do not have a working Windows. Windows only boots from a primary NTFS partition with the boot flag. You have no primary NTFS partitions and have boot flag on a Linux partition. Was sda1 a small NTFS boot partition for a Windows install in a logical partition? – oldfred Aug 6 '17 at 14:25

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