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.