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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.

Any ideas?

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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

  • Install bumblebee agian and it will work properly
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