My Ubuntu 13.10 had a problem with the source.list where it wasn't able to update.
1. Fix Ubuntu 13.10 source list, and upgrade to the latest version (14.04 at the time of writing)
To check which version of Ubuntu you're using, run this:
Everytime I tried
sudo-apt-get update, I got loads of 404 errors, as seen here: http://askubuntu.com/questions/29071/apt-get-update-cannot-find-ubuntu-servers.
To fix this, and upgrade to version 14.04, I ran the following commands:
sudo sed -i 's/saucy/trusty/g' /etc/apt/sources.list sudo apt-get update sudo apt-get upgrade
2. Install Ubuntu Desktop
Next, to install desktop, run this:
apt-get install ubuntu-desktop
Now to see if your Ubuntu version has updated run this again:
3. Set up VCN
Then, just follow this guide on digitalocean.
Install VNC server:
sudo apt-get update sudo apt-get install xfce4 xfce4-goodies tightvncserver
Run VNC server, and set your password
..just follow the digital ocean guide, and you should be able to access the desktop Ubuntu from a VNC server viewer