I am currently using OwnCloud that was installed from cpanel on a subdomain of my webspace.
I wish to remove it and install NextCloud instead. Is it possible to use the setup-nextcloud.php file to install next cloud on a subdomain?
Yes, it is possible.
Or, what you could do:
Install into a subdirectory, e.g.
/www/nextcloud
Then later configure your subdomain to point to this very directory.
That’s what I did and the login page only loops.
The folder address works: mydomain.com/nextcloud_folder
But, nextcloud.mydomain.com doesn’t.