You are welcome.

But:
you should immediately revert that change!

Has there been any file/link under /usr/share/ubunt* ?
I guess not. As it looks like I put there a symlink to the really meant file under /opt/usr//share/doc/lynx/lynx_help/lynx_help_main.html.

And that is even more strange! As there under /opt/usr/share/lynx/lynx_help/lynx_help_main.html is the same file once more?

Normally all docs are purged after installation, of course only the ones under /usr/share/doc/ and under /opt/usr/share/doc.

So please check if you have
/opt/usr//share/doc/lynx/lynx_help/lynx_help_main.html
or
/opt/usr/share/lynx/lynx_help/lynx_help_main.html
or both?

Delete that /usr/share/ubuntu-artwork/index.html file again and then edit (as root) the following config file
/etc/lynx.cfg
and exchange like following:
This is the not-lazy solution. And gives you full access to the underlying help documents.


--
seems like this package could need some care/maintenance?