Once in Ubuntu, create a home directory, for this example we're going to be working in a directory called xtau-test, and create a sub-directory in it called xtuple-admin-utility, and note its location. This will be the directory you will be cloning the xTuple github repositories to so it's important to know this directory's location path.
Then navigate to the command prompt on your Linux system. The command terminal will be where all the xTuple admin utility setup prompts will be run in. All of the following installation steps will be done in the command terminal.