I have finally got Ubuntu and Windows 8 booting correctly under EFI on Dell i660. However I am seeing error message right before the GRUB splash screen - error: efi disk read error. (x3) These are followed by - Secure Boot forbids loading module from /boot/grub/gettext.mod Then it loads the GRUB2 splash screen for (GRUB version 1.99-21ubunutu3.10). Is there something I can do to fix these errors. /boot looks ok and boot-repair did not help. If I disable the Secure Boot in BIOS I get rid of the loading module error, but am still getting the efi disk read errors. Are there are logs that I can look at ? Nothing surprising in /var/log/*.log.