Open your Internet browser and search for Ubuntu 22.04.
Click “https://releases.ubuntu.com/jammy/“ from the search result.
Click on the link corresponding to “Server install image”.
Or, move toward the end of the page and click ubuntu-22.04.4-live-server-amd64.iso.
It downloads the image you want.
Important
Ubuntu regularly updates their images and the 22.04.4 is a point release for their long-term support release. The version may be updated in the future but any 22.04 point release from 03 onwards should be fine.
This image is approximately 2.0 gb in size.