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Im dual booting linux and windows on my Sony F1521KSNB (1.8GHz Intel Core 3rd Gen i5 processor, 4GB RAM,NVIDIA GeForce GT 740M ). I realized Ubuntu wasnt using my Nvidia chip and googled to find out more. Then I came across bumblebee. I did a fresh installation of Ubuntu 13.10 and then followed this https://wiki.ubuntu.com/Bumblebee to install it. After rebooting i get this error after I type

optirun firefox

[ 1040.265565] [ERROR]Cannot access secondary GPU - error: Could not load GPU driver [ 1040.265688] [ERROR]Aborting because fallback start is disabled.

I then googled a lot followed a lot of answers in askubuntu and other sites but to no avail. Any working solution is appreacted .

Steps i took includes this and others.Nothing seems to work.

sudo gedit /etc/bumblebee/bumblebee.conf

On the bottom of the first section you find

change it to

further down:
## Section with nvidia driver specific options, only parsed if Driver=nvidia
# Module name to load, defaults to Driver if empty or unset
KernelDriver=nvidia-current ------> Change to KernelDriver=nvidia
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Finally fixed it! –  nemesis Feb 28 '14 at 13:35

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