I cannot see Nextcloud web interface (Server installation on a Linux Ubuntu server)

Iā€™m new in Nextcloud. I installed a Nextcloud on a Ubuntu 22.04 LTS server following
Example installation on Ubuntu 22.04 LTS ā€” Nextcloud latest Administration Manual latest documentation .
I also configured a web Apache server but once I try to access NextCloud server on my server (URL:
https://rendena101.cloud/nextcloud/) , it appears only the PHP code of index.php file. PHP is installed. Where can I fix this? Is something that I missed?
Thank you @ecor

You need to make sure that php is enabled on your server and that you have configured your webserver correctly so that it executes PHP code instead of displaying it. See e.g.

Thank you,
I found some suggestions with my version of PHP 8.1 and Ubuntu 22 . I tried but currently with no success. (see below) I 'm still continuing to search.

Thank you,
I found some suggestions with my version of PHP 8.1 and Ubuntu 22 . I tried but currently with no success. (see below) I 'm still continuing to search.

https://askubuntu.com/questions/632918/php-showing-source-code-in-localhost/1483660#1483660

Thank you, I solved the issue, after re-installing PHP and trying a second time with suggestion below: