I am curious about the reason. In UEFI menu it shows two instance of Ubuntu.Is this the reason i am getting Secure Boot Violation? It never showed me boot violation error message before I downgraded Ubuntu from 16.04 to 14.04 using USB drive. I can still load windows and Ubuntu after pressing enter on the secure boot violation message.

1

2 Answers

You can check the two Ubuntu entries with

sudo efibootmgr -v

to see what each one runs. Probably, one is shimx64.efi, and the other is grubx64.efi. Only shimx64.efi will run with secure boot enabled, with secure boot disabled, both should boot. You have a third bootloader which might be invoked after the boot failure (of grubx64.efi), /EFI/Boot/bootx64.efi. This is probably a copy of shimx64.efi, and will boot successfully if grubx64.efi is also in the same directory. Zacharee1 is right, secure boot is optional, and with the 16.04 release tightening up on (third party) module signatures, is becoming more difficult to use.

1

If you want to install Ubuntu on UEFI with secure mode then Choose GPT partition scheme for UEFI or you need to secure mode off in BOIS menu to install Ubuntu on BOIS/MBR partition scheme for UEFI.

Your Answer

Sign up or log in

Sign up using Google Sign up using Facebook Sign up using Email and Password Submit

Post as a guest

Post Your Answer Discard

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy