There is no particularly easy way of getting a GUI on a cloud instance of Ubuntu - unless you are reasonably familiar with Ubuntu in the first place - but its really not necessary.
If or rather when you do get logged on, here are the commands I ran to get my various vaults running
Enter these one line at a time Anything after the # is a comment - don't type it
sudo mkdir /maidsafe #Use root priveleges to make a directory called maidsafe
sudo chown -Rv ubuntu:ubuntu /maidsafe/ #Use root priveleges to change the owner of that directory - so you dont have to mess too much with root priveleges
cd /maidsafe/ # Change to your maidsafe direectory - the prompt will change
wget https://github.com/maidsafe/safe_vault/releases/download/0.13.0-dev/safe_vault-v0.13.0-linux-x64.zip #Download the SAFE vault code
sudo apt-get install unzip #Use root privs to install unzip - think Winzip but far superior
unzip safe_vault-v0.13.0-linux-x64.zip #Unzip the code
cd safe_vault-v0.13.0-linux-x64/ # change into the code directory
nano safe_vault.vault.config #Edit the vault config - change the max size (delete the leading '21' insert '7' (rough but it works)
nano safe_vault.crust.config #Edit the crust config - just replace with a copy grabbed from further up this page
sudo ./safe_vault #Use root privs to actually run the vault
You need that last sudo because the chunks are written to /tmp which is owned by the root user - again there are more elegant ways round this - but this works well enough for our testing here.
I'm sure others will point out more "correct" ways of achieving this but its not really difficult - just follow the steps and shout for help if you get stuck