You can check version of Ubuntu you are running either by checking System Information or using Command Line.
Instructions:
- Using System Information
Open Dash home, and search for System Info. In System Info dialogue, Ubuntu version number is given below the logo of Ubuntu in the right part of dialogue.


- Using Command line (Terminal)
Open Terminal and type in the following command and press Enter, which will print Distribution Specific Information of the operating system you are having
lsb_release -a

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