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I have a dual-boot installation with Ubuntu 14.04 and Windows 8. I recently came across grub error and had to use boot-repair-disk. Now after fixing the system, Windows 8 appears to twice on sda1 and sda2. How can I remove the second one? I have checked and both of them boot the same.

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    Many users do not realize the 100MB Boot partition for Windows is vital, so they delete it. Boot-Repair copies Windows boot files into your main (c:) partition so you could still boot from that. Settings are not in any grub configuration files, but are found by os-prober which looks for those boot files. You can turn off os-prober and copy one boot stanza into 40_custom. help.ubuntu.com/community/MaintenanceFreeCustomGrub2Screen
    – oldfred
    Nov 22, 2014 at 15:49
  • @vishalmullur I have the pb. I just created an issue to get help for that : github.com/campadrenalin/os-prober/issues/4
    – SebMa
    Nov 20, 2020 at 19:16

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You can edit the grub configuration file at /etc/grub/grub.cfg, removing the offending entry and then enter sudo update-grub, however this can be a little difficult.

An alternate solution is to use GrubCustomizer

sudo add-apt-repository ppa:danielrichter2007/grub-customizer
sudo apt-get update
sudo apt-get install grub-customizer

Then run the program grub customizer from the Dash. It will display the menu nicely, allow you to delete an entry, and update grub for you

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    Nice workaround but unfortunatly the next time the linux-kernel is updated, the update-grub script will be run and then the os-prober will be called and the script /usr/lib/os-probes/mounted/20microsoft will re-detect the Windows 8 BCD entries twice.
    – SebMa
    Nov 20, 2020 at 19:12

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