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I have decided to retry installing Ubuntu when 14.04 came out... and I doomed my computer again. I have Windows 7 installed, and I followed this guide to dual boot. After installation, I see the GRUB rescue screen, telling me there is no such device (followed by a rather long set of letters an numbers).

I am unable to boot into either Windows or Ubuntu. Last time I had this error, I just ran boot repair and it fixed it, but this time, even that won't work. (To install boot repair, I had to change the repository distribution to 'saucy', otherwise it doesn't find the package.)

I tried boot repair twice:



To at least save Windows, what are my options?

Edit: This is the BootInfo summary created by the boot repair tool:

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possible duplicate of Boot error > no such device: grub rescue. Also worth reading are the answers to: How can I repair grub? (How to get Ubuntu back after installing Windows?). – karel Apr 18 '14 at 1:10
Thank you for commenting, I will try that solution. – Luka Kotar Apr 18 '14 at 1:12
I have tried both solutions (the accepted answers), but it still doesn't work. Can I somehow just uninstall GRUB and revert to using a single OS? – Luka Kotar Apr 18 '14 at 1:53
I will try this solution to get Windows back up and running. One question before I do that: should I remove the Linux partitions? (EXT5 and Linux Swap) I'm just asking to be safe. – Luka Kotar Apr 18 '14 at 2:03
Before you change the ext4 and swap partitions, it would be a good idea to look at how to uninstall Grub and revert to using a single OS from the Ubuntu point of view: How to remove Ubuntu and put Windows back on?. – karel Apr 18 '14 at 2:17

Luke, I used this to help me set up a dual boot with the previous ver of Ubuntu and Win 7:

I used Ext4 rather than btrfs but it explains the concepts more clearly. I found I was able to to boot into Win7 but not Ubuntu and EasyBCD fixed my boot config. This may be the equivalent in Linux:

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