To check the version of Ubuntu you are running, there are several methods you can use:

1. Using the command line: Open the terminal by using the keyboard shortcut Ctrl + Alt + T. Then, you can use one of the following commands to find out your Ubuntu version:

• lsb_release -a
• cat /etc/lsb-release
• cat /etc/os-release
• hostnamectl

2. Using the GUI settings: If you prefer not to use the command line, you can also find your Ubuntu version in your GUI settings. Here are the steps:

• Click on the "Show Applications" icon in the bottom left of your screen.
• Type "Settings" into the search bar at the top of the screen and click on it.
• Select the "About" tab from the left menu.
• Scroll to the bottom of the list of items to find your Ubuntu version next to the "OS Name" heading.

All of these methods will display your Ubuntu version information. Knowing your Ubuntu version is important for applying security patches and software updates.