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I've looked at the answers on this question, but none of them solved my problem:

How can I repair grub? (How to get Ubuntu back after installing Windows?)

My system is partitioned as follows. /dev/sdb5 is Ubuntu's root partition.

enter image description here

I installed Windows 7 after installing Ubuntu. All my Ubuntu partitions (except swap) have the btrfs filesystem.

Installing Windows left me unable to boot in Ubuntu. Running a live USB, the live Ubuntu was not able to find the Ubuntu partitions using os-prober, probably due to this bug.

I'd like to get Ubuntu booting again. Can you help me?

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Use this image and start from USB, when using yumi (pendrivelinux.com) choose install unlisted ISO (grub) option.

http://www.supergrubdisk.org/super-grub2-disk/

You can detect OSes and also repair grub.

HowTo:

  • Insert bootmedia in to its drive (e.g. USB or CD/DVD)
  • Set the media to be the first booting device in BIOS
  • Then boot; if you used yumi select "grub bootable isos or xp/7..." choose the SGD2
  • Find out where your Linux is installed (detect any OS) and select
  • Install GRUB using

    sudo grub-install /dev/YOURLINUXDRIVE

  • Finished

  • -

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