I've been running Ubuntu 12.04.2 on my Lenovo IdeaPad P400 for the past few weeks and just got around to repair my Windows 8 boot. In order to access the LivCD, I had to boot in legacy mode. I ran boot repair with the recommended settings from the LiveCD and restarted the computer after completion.
However, once it rebooted, I got a black screen saying ubuntu has been blocked by the current security policy. This screen keeps repeating until the computer is shut down. I cannot get access to the grub menu or bios.
Here is my boot info from boot repair: paste.ubuntu.com
Any help is much appreciated.