xubuntu 18.04 installing with nvidia graphics, tearing fixes

Before installing (running LiveCD/USB)

Edit GRUB options in the live-cd menu by adding "nomodeset" argument to the  kernel parameters string.

After installing

Repeat "nomodeset" option as described above before the first boot.

1. "apt install nvidia-driver-435"
2. Reboot
3. In "NVidia X Server Settings -> X Server Display Configuration -> Advanced..." switch on "Force Composition Pipeline".
4. Enable XFCE compositor (Menu->Window Manager Tweaks->Compositor->Enable display compositing)
5. Enable the "Synchronize drawing to the vertical blank" option in the "Window Manager Tweaks" "Compositor" tab.

Fix nvidia OpenCL/CUDA driver after resume from suspend

fixes OpenCL/CUDA/NVENC after suspend:

sudo rmmod nvidia_uvm && sudo modprobe nvidia_uvm

transcoding using nvenc ffmpeg

./ffmpeg -i /mnt/file.avi -c:v nvenc_h264 -preset slow -b:v 2000k -c:a libmp3lame testnvenc.mp4
ffmpeg version 3.0.2 Copyright (c) 2000-2016 the FFmpeg developers
  built with gcc 5.3.1 (Ubuntu 5.3.1-14ubuntu2.1) 20160413
  configuration: --enable-opencl --enable-opengl --enable-nvenc --enable-nonfree --prefix=/home/y/ --extra-cflags='-I /home/y/nvidia_video_sdk_6.0.1/Samples/common/inc' --enable-libmp3lame