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Usually when we install Windows after installing GNU/Linux, we usually lose the Grub. Which is the best way to recover grub when we lost grub or what are the possible different ways.

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You need to boot system using LiveCD of ubuntu and run below command to install grub :

sudo grub-install /dev/XXX

above command will install grub and it also Keep windows bootloader NTLDR into grub , then you can choose any one OS while boot.

/dev/XXX this is your HDD where ubuntu installed (eg: grub-install /dev/sdb).

Please refer below link for more information :

https://help.ubuntu.com/community/RecoveringUbuntuAfterInstallingWindows

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