Where can I download Ubuntu 16.04?

I am unable to find the link for downloading Ubuntu 16.04 onto my desktop/laptop. I am able to see the link only for 18.04, but I need 16.04.

There are many download options listed in the main download page: http://ubuntu.com/download, which include Alternative downloads.

The top two lines of the Main Download page has menu items of important links about Ubuntu and the available download options.

For the LTS versions, from the main download link Ubuntu LTS Download (the link you are most likely referring to in your question), look for the see our alternative downloads. link. You'll find it under the Download icon on the page.

The other supported versions, including 16.04 will always have their direct download link listed.

Note: Alternative Downloads, Ubuntu flavours and other download choices are also linked in the Link menu just below Main menu string that referrs to ohter important links about Ubuntu.