I've followed https://ubuntu.com/tutorials/install-and-configure-wordpress to install and configure wordpress on an Ubuntu 20.04 machine. I can access the example site at .../blog and administer it at from .../blog/wp-admin as expected.
How do I change it so that instead of being available at .../blog it is available at either .../somethingelse or just http://myserver.example.com ?
I'd have expected https://wordpress.org/support/article/changing-the-site-url/ to be helpful but it isn't especially - if I change the "Site Address (URL)" and "WordPress Address (URL)" fields the site no longer functions. I would expect I'd need to change /etc/apache2/sites-available/wordpress.conf so that the "Alias" line in there doesn't refer to "/blog" any more, but there's no mention of that at https://wordpress.org/support/article/changing-the-site-url/ . Similarly there's no reference to /etc/wordpress/config-myserver.example.com.php , although this is presumably the "wp-config.php" that https://wordpress.org/support/article/changing-the-site-url/ refers to.
I'm guessing that Ubuntu (or Debian) have repackaged wordpress so that things are not quite in the same places as they might be on another OS. What exactly do I need to do, button by button, to change .../blog to .../somethingelse ? Obviously, I'm looking for instructions that will work on Ubuntu 20.04 here.