In the newer versions of Linux, an open source driver is usually installed by default to run the graphic cards. However this driver can sometimes be absolutely messy, and it is essential to remove the Nouveau driver and install the binary driver from Nvidia.
However, if after you reboot into the service mode from grub menu, and try to install the NVIDIA-Linux-x86_64-xxx.run driver in the init 3 level, the program will kick you out saying that the Nouveau driver is still in use.
The way to disable the Nouveau drivers from kernel is to boot in the service mode and run the following commands:
echo options nouveau modeset=0 | sudo tee -a /etc/modprobe.d/nouveau-kms.conf update-initramfs -u
Once its done reconfiguring the kernel, you will need to reboot, and again get to service mode.
After that, get into init 3 mode, and install the NVIDIA-Linux-x86-64.xxx.run script. The installation should be successful at this point.