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I have Freya alongside with Windows 8 on UEFI mode. Recently I installed bumblebee on my Freya, But when I want to run optirun command it says :
module 'nvidia' is not found
I also read this answer.
The problem is secure boot, it didn't allow bumblebee to install nvidia.
Try to uninstall bumblebee
sudo apt-get install ppa-purge
sudo ppa-purge ppa:bumblebee/stable
sudo apt-get purge bumblebee
Turn of secure boot from your bios setting
Required, but never shown