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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.


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"Finally got Ubuntu and Windows 8 booting correctly" - what do you mean by that? – Pavel Dec 14 '13 at 22:52
I had lot of trouble with Windows 8 changing NVRAM settings and preventing GRUB from loading. Finally was able to fix it from within Windows using bcdedit. – Chintan Dec 14 '13 at 22:55
gettext.mod error is gone after multiple boot-repair runs with grub re-install. Also, the efi disk read error seems to only happen after booting into Windows and then rebooting. It must be because I am using Windows bootmgr to load grub. – Chintan Dec 15 '13 at 1:18

Concerning the "disk read error," I recommend you disable the Windows Fast Startup feature, as described here or here. That feature is better called "Fast Corruption" in a dual-boot environment, since it can result in disk corruption. That may be what's causing the problem, but I can't guarantee that. It's also conceivable that you've got a defective disk, so running a SMART test on the disk may be worthwhile. If it shows bad sectors, replace the disk immediately!

As to the module error, I wouldn't worry about it, so long as GRUB works correctly; or you can disable Secure Boot. (Disabling Secure Boot will increase your risk of becoming infected by pre-boot malware, though.)

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