Comment 13 for bug 1229738

Hi! I have the same problem: install everything and boot in EFI mode, then I see "error: efidisk read error" and I get grub> prompt. I found a fix not mentioned here: after the install, boot from a LiveCD, install boot-repair and in its options unselect "SecureBoot" option. [I don't know what's wrong with the SecureBoot, but I won't investigate it further. Also, I don't know if the new grubx64.efi file the boot-repair writes to the EFI partition boots in SecureBoot or not.] Proceed with the commands it offers (when it asks about buggy-kernel, say No) and reboot. More details here: http://ubuntuforums.org/showthread.php?t=2201239.

I confirm that the patch proposed by Dick Porter executed as Thomas C. explains also fixes my problem, though the "efidisk read error" flashes for an instant before it starts to boot.

I also tried the solution of creating a grub.cfg file in the EFI partition (proposed by Andy Sayler) and it didn't work, though Andy had a slightly different setup: /boot and / on the same RAID array. I tried some obvious tweaks but with no luck.