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After I did a boot-repair,, I get this message:

Please do not forget to make your BIOS boot on sda2/EFI/ubuntu/shimx64.efi file!

I can go to the BIOS but there is no option about that shimx64.efi file.

How do I make my BIOS boot on sda2/EFI/ubuntu/shimx64.efi file?

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is it not booting? actually you don't need to do anything. – Web-E Mar 19 '13 at 5:26
Please boot an Ubuntu emergency disc and post the output of sudo efibootmgr -v. (You may need to do sudo apt-get install efibootmgr first.) – Rod Smith Mar 19 '13 at 15:35

If you can boot into Ubuntu, then you don't have anything to do. (because your BIOS already boots the sda2/EFI/ubuntu/shimx64.efi file).

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