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The PHP and the apache2 version may have changed since this article was written.

https://www.digitalocean.com/community/tutorials/how-to-install-linux-apache-mysql-php-lamp-stack-on-ubuntu-22-04

$ sudo apt update
$ sudo apt install apache2

$ sudo ufw app list
$ sudo ufw allow in "Apache"
$ sudo ufw status

$ cat openssh-server
[OpenSSH]
title=Secure shell server, an rshd replacement
description=OpenSSH is a free implementation of the Secure Shell protocol.
ports=22/tcp

$ sudo ufw allow 'OpenSSH'

$ sudo ufw enable
Firewall is active and enabled on system startup
$ sudo ufw status
Status: active
 
To                         Action      From
--                         ------      ----
OpenSSH                    ALLOW       Anywhere
OpenSSH (v6)               ALLOW       Anywhere (v6)

If you do not want the sshd to be accessible from outside of your local network, you can do the following:

$ sudo ufw delete allow 'OpenSSH'
Rule deleted
Rule deleted (v6)
$ sudo ufw status
Status: active

$ sudo ufw allow from 192.168.1.0/24 to any port 22 proto tcp comment 'Allow ssh from local'
Rule added
$ sudo ufw status
Status: active
 
To                         Action      From
--                         ------      ----
22/tcp                     ALLOW       192.168.1.0/24             # Allow ssh from local

$ cat apache2-utils.ufw.profile
[Apache]
title=Web Server
description=Apache v2 is the next generation of the omnipresent Apache web server.
ports=80/tcp
 
[Apache Secure]
title=Web Server (HTTPS)
description=Apache v2 is the next generation of the omnipresent Apache web server.
ports=443/tcp
 
[Apache Full]
title=Web Server (HTTP,HTTPS)
description=Apache v2 is the next generation of the omnipresent Apache web server.
ports=80,443/tcp

So, you should do one of these three commands.

$ sudo ufw app info 'Apache'
$ sudo ufw app info 'Apache Secure'
$ sudo ufw app info 'Apache Full'

Same as the sshd, if you do not want the apache2 to be accessible from outside of your local network, you can do the following:

$ sudo ufw delete allow 'Apache'
$ sudo ufw delete allow 'Apache Secure'
$ sudo ufw delete allow 'Apache Full'

$ sudo ufw delete allow 'Apache'
$ sudo ufw delete allow 'Apache Secure'
$ sudo ufw delete allow 'Apache Full'

$ sudo ufw allow from 192.168.1.0/24 to any port 80 proto tcp comment 'Allow http from local'
$ sudo ufw allow from 192.168.1.0/24 to any port 443 proto tcp comment 'Allow https from local'

$ sudo ufw enable
Firewall is active and enabled on system startup

$ git diff etc/ufw/ufw.conf
diff --git a/etc/ufw/ufw.conf b/etc/ufw/ufw.conf
index 8336b91..28fe534 100644
--- a/etc/ufw/ufw.conf
+++ b/etc/ufw/ufw.conf
@@ -3,7 +3,7 @@
 
 # Set to yes to start on boot. If setting this remotely, be sure to add a rule
 # to allow your remote connection before starting ufw. Eg: 'ufw allow 22/tcp'
-ENABLED=no
+ENABLED=yes
 
 # Please use the 'ufw' command to set the loglevel. Eg: 'ufw logging medium'.
 # See 'man ufw' for details.

http://localhost
The default Ubuntu 24.04 Apache web page is there for informational and testing purposes.

$ sudo apt-get install php libapache2-mod-php

$ php --version
PHP 8.3.6 (cli) (built: Dec  2 2024 12:36:18) (NTS)
Copyright (c) The PHP Group
Zend Engine v4.3.6, Copyright (c) Zend Technologies
    with Zend OPcache v8.3.6, Copyright (c), by Zend Technologies

$ apt list 2>/dev/null |grep -e "^php.*installed"
php-common/noble,now 2:93ubuntu2 all [installed,automatic]
php8.3-cli/noble-updates,noble-security,now 8.3.6-0ubuntu0.24.04.3 amd64 [installed,automatic]
php8.3-common/noble-updates,noble-security,now 8.3.6-0ubuntu0.24.04.3 amd64 [installed,automatic]
php8.3-opcache/noble-updates,noble-security,now 8.3.6-0ubuntu0.24.04.3 amd64 [installed,automatic]
php8.3-readline/noble-updates,noble-security,now 8.3.6-0ubuntu0.24.04.3 amd64 [installed,automatic]
php8.3/noble-updates,noble-security,now 8.3.6-0ubuntu0.24.04.3 all [installed,automatic]
php/noble,now 2:8.3+93ubuntu2 all [installed]

$ sudo apt-get install php-xml # (for Dokuwiki)

@@@@@@@@@@@@@@@@@@@@ (a2enmod is not necessary.)

a2enmod
script that enables the specified module within the apache2 configuration. It does this by creating symlinks within  /etc/apache2/mods-enabled.
a2dismod
disables a module by removing those symlinks. 

@@@@@@@@@@@@@@@@@@@@

You can change the user name whatever you want.

$ sudo adduser wweb
$ sudo usermod -aG sudo wweb
$ sudo usermod -aG wweb pctr # replace pctr with your main account's group name

$ sudo -p mkdir /home/wweb/www/html # instead of (sudo mkdir -p /var/www/your_domain)

$ sudo chown -R wweb:wweb /home/wweb/www/html # instead of (sudo chown -R $USER:$USER /var/www/your_domain)

$ sudo vim /etc/apache2/sites-available/wweb.conf # instead of (sudo vim /etc/apache2/sites-available/your_domain.conf)

<VirtualHost *:80>
    ServerName your_domain
    ServerAlias www.your_domain 
    ServerAdmin webmaster@localhost
    DocumentRoot /var/www/your_domain
    ErrorLog ${APACHE_LOG_DIR}/error.log
    CustomLog ${APACHE_LOG_DIR}/access.log combined
</VirtualHost>

ServerAdmin Directive in Apache2 is deprecated.

Syntax:	ServerName [scheme://]domain-name|ip-address[:port]
 ex)
ServerName www.example.com

Or try this.

$ cat /etc/hostname
ubuntupctr

Then

ServerName ubuntupctr

is enough.

<VirtualHost *:80>
	ServerName ubuntupctr
	ServerAdmin webmaster@localhost
	#DocumentRoot /var/www/html
	DocumentRoot /home/wweb/www/html
	ErrorLog ${APACHE_LOG_DIR}/error.log
	CustomLog ${APACHE_LOG_DIR}/access.log combined
</VirtualHost>

To set the 'ServerName' directive globally in Apache, edit the /etc/apache2/apache2.conf file and add the line ServerName your.server.ip.address or ServerName your.domain.name under the global configuration section. After saving the changes, restart Apache using sudo systemctl restart apache2 to apply the configuration.

So, Add a line containing "ex) ServerName 127.0.0.1" to the end of the file:

End of file:

ServerName ubuntupctr

$ cgit diff etc/apache2/envvars
diff --git a/etc/apache2/envvars b/etc/apache2/envvars
index 708d170..a863276 100644
--- a/etc/apache2/envvars
+++ b/etc/apache2/envvars
@@ -13,8 +13,8 @@ fi
 # Since there is no sane way to get the parsed apache2 config in scripts, some
 # settings are defined via environment variables and then used in apache2ctl,
 # /etc/init.d/apache2, /etc/logrotate.d/apache2, etc.
-export APACHE_RUN_USER=www-data
-export APACHE_RUN_GROUP=www-data
+export APACHE_RUN_USER=wweb
+export APACHE_RUN_GROUP=wweb
 # temporary state file location. This might be changed to /run in Wheezy+1
 export APACHE_PID_FILE=/var/run/apache2$SUFFIX/apache2.pid
 export APACHE_RUN_DIR=/var/run/apache2$SUFFIX

$ sudo a2ensite wweb.conf
Enabling site wweb.
To activate the new configuration, you need to run:
  systemctl reload apache2

disable the default site defined in 000-default.conf

$ sudo a2dissite 000-default.conf
Site 000-default disabled.
To activate the new configuration, you need to run:
  systemctl reload apache2

Look at the current list of virtual hosts:

$ apache2ctl -S
VirtualHost configuration:
*:80                   win11kan (/etc/apache2/sites-enabled/wweb.conf:1)
ServerRoot: "/etc/apache2"
Main DocumentRoot: "/var/www/html"
Main ErrorLog: "/var/log/apache2/error.log"
Mutex watchdog-callback: using_defaults
Mutex default: dir="/var/run/apache2/" mechanism=default
Mutex mpm-accept: using_defaults
PidFile: "/var/run/apache2/apache2.pid"
Define: DUMP_VHOSTS
Define: DUMP_RUN_CFG
User: name="wweb" id=1001 not_used
Group: name="wweb" id=1001 not_used

        DirectoryIndex index.php index.html index.cgi index.pl index.xhtml index.htm

$ cgit diff /etc/apache2/apache2.conf
diff --git a/etc/apache2/apache2.conf b/etc/apache2/apache2.conf
index 2410e6d..b943101 100644
--- a/etc/apache2/apache2.conf
+++ b/etc/apache2/apache2.conf
@@ -167,9 +167,9 @@ Include ports.conf
        Require all granted
 </Directory>
 
-<Directory /var/www/>
-       Options Indexes FollowSymLinks
-       AllowOverride None
+<Directory /home/wweb/www/>
+       Options Indexes FollowSymLinks execCGI
+       AllowOverride All
        Require all granted
 </Directory>

$ cgit diff /etc/apache2/conf-available/serve-cgi-bin.conf
diff --git a/etc/apache2/conf-available/serve-cgi-bin.conf b/etc/apache2/conf-available/serve-cgi-bin.conf
index ae660b1..19fa042 100644
--- a/etc/apache2/conf-available/serve-cgi-bin.conf
+++ b/etc/apache2/conf-available/serve-cgi-bin.conf
@@ -8,8 +8,8 @@
        </IfModule>
 
        <IfDefine ENABLE_USR_LIB_CGI_BIN>
-               ScriptAlias /cgi-bin/ /usr/lib/cgi-bin/
-               <Directory "/usr/lib/cgi-bin">
+               ScriptAlias /cgi-bin/ /home/wweb/www/html/dokuwiki/
+               <Directory "/home/wweb/www/html">
                        AllowOverride None
                        Options +ExecCGI -MultiViews +SymLinksIfOwnerMatch
                        Require all granted

		# DocumentRoot /var/www/html
		DocumentRoot /home/wweb/www/html

test for configuration errors:

$ sudo apache2ctl configtest
Syntax OK

reload Apache so these changes take effect:

$ sudo systemctl restart apache2
$ sudo systemctl status apache2
$ sudo systemctl status apache2
● apache2.service - The Apache HTTP Server
     Loaded: loaded (/usr/lib/systemd/system/apache2.service; enabled; preset: enabled)
     Active: active (running) since Tue 2025-02-25 20:27:32 JST; 5s ago
     .....
or
$ sudo /etc/init.d/apache2 restart
$ sudo /etc/init.d/apache2 status

make wweb_ssl.conf from 000-default.conf

/etc/apache2/sites-available/wweb_ssl.conf –

<VirtualHost *:443>
        ServerAdmin webmaster@localhost
 
        DocumentRoot /home/wweb/www/html
 
        ErrorLog ${APACHE_LOG_DIR}/error.log
        CustomLog ${APACHE_LOG_DIR}/access.log combined
 
        SSLEngine on
 
        SSLCertificateFile      /etc/ssl/certs/ssl-cert-snakeoil.pem
        SSLCertificateKeyFile   /etc/ssl/private/ssl-cert-snakeoil.key
 
        <FilesMatch "\.(?:cgi|shtml|phtml|php)$">
                SSLOptions +StdEnvVars
        </FilesMatch>
        <Directory /usr/lib/cgi-bin>
                SSLOptions +StdEnvVars
        </Directory>
</VirtualHost>

–

sudo a2ensite wweb_ssl.conf
sudo a2enmod ssl
sudo systemctl reload apache2