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I just upgraded to version Ubuntu 12.04 LTS and everything was fine until the restart and entered the grub. I give the first option to enter the menu and I get a screen with two errors that would be these:

  • error: cannot read the Linux headers
  • error: you need to load the kernel first

From there it returns to the menu and I have no idea what to do.

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@RicardoAltamirano now that we've got it translated to English, this question is appropriate for here. Not every Ubuntu/Mac/etc. question needs to be migrated. See When should questions be moved to AskDifferent/AskUbuntu/…? – Ƭᴇcʜιᴇ007 Nov 30 '12 at 19:10
    

In the menu it drops you back to, it should have a prompt underneath that says "Hit e to edit before boot".

Hit that, and then on the next page you should see the grub commands, make sure the kernel is above the initrd. Something like:

set root=(hd0,1)             #Just leave this one for now
linux /boot/vmlinuz          # This should be here, initrd should be below it.
initrd /boot/initrd.img

After that, I think you hit escape and B or something (a prompt should show you).

Let us know if your grub menu already looks that way.

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