I have Ubuntu installed as the sole operating system on a Lenovo Y70 touch laptop. It was version 16.04. After a recent update, the system would not start. Instead, I am presented with a blue screen saying verification failed: (0x1A) Security Violation. I can't fire up a terminal, boot from a live USB or use an alternate screen.

I went into the BIOS and attempted to disable UEFI. But the change won't stick. It always reverts to a UEFI boot.

I don't have a recovery disk, and Lenovo won't provide a way to revert to Windows. Has anyone come across this problem before?

Turn off secure boot in the BIOS/UEFI. Also try to save settings or press F10 and choose yes at the save dialog.

  • I have tried to do this, as other threads suggest. It doesn't seem to stick - whether I save or press F10. But thank you for your reply anyway. I Wonder if there is a way to enter a more "advanced" BIOS. I use the NOVO button to get to BIOS, or press Fn and F2 – Cahir Dec 6 at 16:54

Well, if that's the case I suggest that you look for a service that can handle this. It looks like a bugous BIOS or similar.

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