What are the potential risks for a Linux newbie when attempting to install PHP5 on a vServer?

One potential risk for a Linux newbie when attempting to install PHP5 on a vServer is encountering compatibility issues with the server's operating system or other software dependencies. To mitigate this risk, it is important to carefully follow the installation instructions provided by the PHP documentation and ensure that all necessary packages are properly installed.

// Sample PHP code snippet for installing PHP5 on a vServer
sudo apt-get update
sudo apt-get install php5