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

I just install Windows 8 without effecting Ubuntu. But it directly boot into Windows 8. How can I re-install grub boot loader?

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marked as duplicate by Eliah Kagan, Mik, Thomas W., fabricator4, Eric Carvalho Jan 12 '13 at 2:45

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2 Answers

I would try using "boot repair". For all my boot problems the default setting has worked for me. From blank grub screens on a 12 year old computer to booting from a windows 7 install.

https://help.ubuntu.com/community/Boot-Repair

Basically you will boot from a live dvd/usb and install boot-repair via this command:

sudo add-apt-repository ppa:yannubuntu/boot-repair && sudo apt-get update

sudo apt-get install -y boot-repair && boot-repair

and select recommended repair. I will uninstall and reinstall grub, so if windows removed it, this will fix it.

Again, for me this has been the easiest way.

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