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Good day, I tried to boot the elementary OS after repair grub (How can I fix a secure boot failing to grub when I installed 0.3.1?), but he has returned me the error attached in the picture and I can no longer access the OS.. also i can´t reach Elementary OS booting from USB pen drive (stuck on black screen)

I´m on a Lenovo z40-70 and win8.1

error: verification failed

Thanks to response from @Ravan.

  • try this: disable secure boot in the bios security tab – Ravan Oct 18 '15 at 14:26
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I faced similar problem.The solution is

disable secure boot in the bios security tab 

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