I have got a Lenovo U-510 with pre-installed windows 8, and I want to have Ubuntu installed in parallel. I installed Ubuntu 12.04, and after that I did Grub repair through online support, since my system was booting directly to Windows.
After the Grub repair was performed, the real problem started for me
windows boot manager has been blocked by current security policy
Can anyone help me in sorting this issue out, apart from giving me the suggestion to use a recovery device?