How to check your Ubuntu and Unity version?

There are two ways to check your Ubuntu version -

1. Through System settings
2. Command Line(Terminal)

Using System settings

     You can check Ubuntu version by going to -

     System settings -> System ->Details

You can see below screen - 

From here you can change default applications, view removable media etc.

Using Command Line(Terminal)

  Just open your terminal and type in command -

  lsb_release -a

You can see output as follows

Checking Unity version

    Checking unity version is again fairly simple. Just open the terminal and type in the command  

unity --version . 

You will then see output as follows -