You will see a gray window in VNC viewer and there is no terminal and window-manager.
Install gnome GUI tools:
sudo apt-get install gnome-panel gnome-settings-daemon metacity nautilus gnome-terminal
Edit the configure file under your home folder:
vi .vnc/xstartup
Copy following content to the file above:
#!/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 &
crontab -e
Add
@reboot /usr/bin/vncserver :1
sudo apt install xfce4 xfce4-goodies
sudo apt-get install xfce4-terminal
vi .vnc/xstartup
Edit
#!/bin/bash
vncconfig -iconic &
xrdb $HOME/.Xresources
startxfce4 &
Application-> Menu -> Setttings -> Windows Manager
Select: Keyboard -> Switch window for same application
Click 'Clear'