Q:

Gradients look bad after installing nvidia drivers

I installed Nvidia drivers using additional drivers in Software and updates, then after removing xserver-xorg-video-nouveau and rebooting, all gradients on my built in screen look pixelated and on my other screen everything is fine,  I think it's a issue with display port but I don't know.
It also happens in videos on youtube, and in programs, How do i fix the issue?
I'm using ubuntu 16.04 lts, intel i7 7700hq, and nvidia gtx 1070 in a laptop.

A:

The better way to install latest Nvidia drivers are 
sudo add-apt-repository ppa:graphics-drivers/ppa

sudo apt-get update

sudo apt-get install nvidia-

then press tab to show the list of candidates. You should see many nvidia-xxx where xxx is a 3 digit number. Then, find the biggest number! 
For example if it is 361, your last command will be
sudo apt-get install nvidia-361

Installing latest driver could fix many problems including your.
update:

Open NVIDIA X Server Settings
select LGD (DP-0) or something similar.
select the Controls tab on the right panel 
Enable Dithering option

