Can't install virtualBox

I have tried installing it from the official website. I downloaded the debian 11 one.. and when I try to install it with the terminal. It fails.. How can I install it and run it properly ?

What does the terminal say when it fails?

I would advise you install gdebi and use that to install Virtual Box plus any other third party .deb package that is not in the official repos.
You also downloaded the wrong package. Download the one marked Ubuntu 19.10 ... 21.04:

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