In with what Oli said:
When something is looking like this it's generally meant to be code in SO - this isn't SO though, it's Ubuntu and has been come to be recognized as command line (Especially in context with the question) So there's no need to place identifiers like $ or (even worse) #. Here are a few examples of ways to effectively use code syntax.
Q: How do I install the marcoceppi-rules application?
You will first need to add the marcoceppi-rules PPA to your system:
sudo add-apt-repository ppa:marcoceppi-rules/ppa
sudo apt-get update
Once that has been added you will need to install marcoceppi-rules from either Applications -> Ubuntu Software Center or via command line:
sudo apt-get install marcoceppi-rules
First you will need to add the marcoceppi-rules PPA then run apt-get:
sudo add-apt-repository ppa:marcoceppi-rules/ppa
sudo apt-get update
sudo apt-get install marcoceppi-rules
There are many ways to word this most all answers I've seen demonstrate a basic workflow and don't just arbitrarily respond with a "code" block. However the format of the answer and what the code block means will be largely dictated by the context of the question.
