Comment 88 for bug 1288572

For me the following solution worked:

1. Install the kernel

linux-image-3.15.0-031500rc2-generic_3.15.0-031500rc2.201404201435_amd64.deb

and the headers

linux-headers-3.15.0-031500rc2_3.15.0-031500rc2.201404201435_all.deb
linux-headers-3.15.0-031500rc2-generic_3.15.0-031500rc2.201404201435_amd64.deb

then reboot.

2. Install nvidia-331, bumblebee and primus

sudo apt-get install nvidia-331 bumblebee bumblebee-nvidia primus

3. Edit the bumblebee.conf file

sudo gedit /etc/bumblebee/bumblebee.conf

line 22: Driver=nvidia
line 55: KernelDriver=nvidia-331
line 58: LibraryPath=/usr/lib/nvidia-331:/usr/lib32/nvidia-331
line 61: XorgModulePath=/usr/lib/nvidia-331/xorg,/usr/lib/xorg/modules

save and reboot

Check if your nvidia card is working with

optirun glxgears -info