Checking your Ubuntu Version
There are two ways to check which version of Ubuntu you are running. You can either check from within Unity, or put in a short command in the Terminal.
Please note that Unity in Ubuntu 12.04 will not render a true version number, but, only a partial. If you need a full version number like 12.04.4 instead of 12.04 you need to use the terminal method only.
Unity is the default desktop environment for Ubuntu 12.04 (Precise Pangolin) and later.
- Click on the Unity button in the upper-left portion of the screen.
- Search 'Details'
In the Terminal
This method will work no matter which version of Ubuntu or desktop environment you are running.
Open the Terminal (keyboard shortcut: Ctrl+Alt+T)
Enter the command lsb_release -a
Your version will be shown on the Description line.