Graphical Environment Setup
# In case your EC2 installation didn't have any GUI packages/X server/etc.
# Ref: https://stackoverflow.com/questions/25657596/how-to-set-up-gui-on-amazon-ec2-ubuntu-server
sudo apt-get install gnome-panel gnome-settings-daemon metacity nautilus gnome-terminal gnome-desktop-environment gnome-theme* gnome-icon-theme
TurboVNC Installation steps