I'm not sure if this is the proper Forum for this, chose Ubuntu + 1 since I am running 13.10... but the question is mostly GRUB related.
I am dual booting Windows 8 and Ubuntu 13.10 with CSM On, UEFI On, and Secure Boot off. I want to turn Secure Boot on.
With SecureBoot off:
I can boot to GRUB and launch Ubuntun 13.10
I can boot to GRUB and launch Windows 8
With SecureBoot on:
I can boot to Grub and launch Ubuntu 13.10
I can hit enter while booting to bring up boot options, F12 to pick a boot drive, and pick the Windows 8 OS. It boots just fine. If I wait for GRUB to launch, then pick any of the Windows 8 files it detected, it will not boot with Secure Boot (Just goes back to GRUB).
Any ideas on how to get GRUB to work with Secure boot with this set-up?
Let me know what other information you need. Thank you.
I have a Lenovo Twist, the boot file has it's own partition of 250MB with a mountpoint of /boot and EXT2.