Dusan: envyng (at least the one in the stable repository) installs Ubuntu's default restricted modules therefore, in order to the test the new driver you can follow these steps:
1) enable the -proposed repository and upgrade the restricted modules
2) Type: sudo apt-get remove nvidia-glx-new
sudo apt-get install --reinstall xserver-xorg-core
3) install the new driver from -proposed: sudo apt-get install nvidia-glx-new
Dusan: envyng (at least the one in the stable repository) installs Ubuntu's default restricted modules therefore, in order to the test the new driver you can follow these steps:
1) enable the -proposed repository and upgrade the restricted modules
2) Type:
sudo apt-get remove nvidia-glx-new
sudo apt-get install --reinstall xserver-xorg-core
3) install the new driver from -proposed:
sudo apt-get install nvidia-glx-new