Install Ubuntu 20.04 “Focal Fossa“

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Visit : https://ubuntu.com/download/desktop

Click on -->  Download (Ubuntu 20.04 LTS)

You'll be redirected to Download page and ISO size will be 2.5 GB desktop version.

Installation:

You can make use of Rufus to make your pen drive bootable.

Download Rufus --> https://rufus.ie/

Rufus will automatically detect your pen drive and ask for downloaded ISO path.

Browse your downloaded 'Ubuntu 20.04 LTS' ISO and click 'start' to continue making pendrive bootable.

In my case two updates were missing from Rufus, so I clicked yes to download and continue.

Later after downloading missing updates a pop-up will appear to format your pendrive and set ISO file for installation. Click yes to proceed and wait for few minutes to finish.

Restart your PC and press your function keys to open boot options from pendrive.