Install nvidia-dkms-390 by entering the following commands in the terminal:
sudo apt update sudo apt install nvidia-dkms-390
Description:
NVIDIA DKMS package
This package builds the NVIDIA kernel module needed by the userspace driver, using DKMS. Provided that you have the kernel header packages installed, the kernel module will be built for your running kernel, and automatically rebuilt for any new kernel headers that are installed.
Homepage: http://www.nvidia.com
Version: 390.48-0ubuntu3
Section: restricted/libs