WEIRD Permalinks Problem

Hello,

Permalinks can be changed to:
Default – /?page_id=323 OR /%postname% with or without the trialing slash. That’s it.

No errors or warnings, it just doesn’t work.

I’ve reinstalled WP several times, and overwritten the files via FTP.

I enabled WP_Debug but there’s no output on the screen or in the log file.

I disabled all plugins, then changed to both 2018 theme and 2020 theme with no joy.

I created rules in my .htaccess file to accomplish my needs, but that doesn’t work either.

This is a dedicated Ubuntu server with tons of other websites (all mine) that use mod_rewrite without issue.

You can set the permalinks to any type of structure you like, but you will only get /%postname%

Any ideas?? I’ve never seen this before.

THANKS ALL