Install libnvidia-encode-390 by entering the following commands in the terminal:
sudo apt update sudo apt install libnvidia-encode-390
Description:
NVENC Video Encoding runtime library
The NVENC Video Encoding library provides an interface to video encoder hardware on supported NVIDIA GPUs. . This package contains the nvidia-encode runtime library.
Homepage: http://www.nvidia.com
Version: 390.48-0ubuntu3
Section: restricted/libs