Kubuntu 14.04:
After installing 

http://launchpad.net/ubuntu/+source/ubuntu-drivers-common/1:0.2.91.6

and

apt-get purge nvidia*
apt-get install nvidia-331

for the first time, update-initramfs triggers were not processed according to 
apt-get console output.
After rebooting nouveau driver was loaded.

As suggested above:
sudo ldconfig -n
sudo update-initramfs -u
sudo reboot

fixed the problem and I was able to switch between intel and nvidia gpu
without problems.

On subsequent reinstallations with:
apt-get purge nvidia*
apt-get install nvidia-331

update-initramfs were processed and didn't need to be executed manually.

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https://bugs.launchpad.net/bugs/1310023

Title:
  14.04: Nvidia Prime is unable to switch to the Nvidia card

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