Install VNC Server

This is how VNC Server is installed in Ubuntu 18.04 LTS

sudo apt update

sudo apt upgrade

sudo apt-get install ubuntu-desktop gnome-panel gnome-settings-daemon metacity nautilus gnome-terminal

sudo apt update

sudo apt upgrade

sudo apt-get install vnc4server

vncserver

sudo nano ~/.vnc/xstartup

#!/bin/sh

Uncomment the following two lines for normal desktop:

unset SESSION_MANAGER

exec /etc/X11/xinit/xinitrc

[ -x /etc/vnc/xstartup ] && exec /etc/vnc/xstartup [ -r $HOME/.Xresources ] && xrdb $HOME/.Xresources xsetroot -solid grey vncconfig -iconic & x-terminal-emulator -geometry 80x24+10+10 -ls -title "$VNCDESKTOP Desktop" & x-window-manager &

gnome-panel & gnome-settings-daemon & metacity & nautilus &