Apache Not Loading index.php on Ubuntu: How to Fix It

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When Apache does not load index.php on Ubuntu, the cause is almost always one of four configuration breaks: the request is reaching a different virtual host or DocumentRoot, Apache is choosing another directory index, PHP has no active handler, or an application’s .htaccess rules are being ignored. A directory listing, a download containing PHP source, an index.html page, and a 403/404/500 response each point to a different layer.

Work through the checks in order. First identify the virtual host and file Apache is actually serving, then verify the file and permissions, inspect DirectoryIndex, choose either libapache2-mod-php or PHP-FPM, and finally test rewrites and logs. Do not configure both PHP execution paths accidentally.

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How Apache decides what to do with a directory request

A request such as https://example.test/ passes through several independent decisions:

1. Virtual-host selection: Apache matches the host name and port to an enabled site.
2. Filesystem mapping: that site’s DocumentRoot becomes the directory Apache searches.
3. Directory index selection: mod_dir uses the DirectoryIndex list to choose a file when the URL ends in a slash. Apache’s documentation describes this directive as the list of resources to look for when a client requests an index of a directory.
4. PHP handling: if the selected file ends in .php, Apache must pass it to a PHP handler rather than return its bytes as text.
5. Application routing: a framework may use .htaccess and mod_rewrite to send the request to a front controller.

A failure at an earlier stage can make a later, correctly configured stage appear broken. For example, changing the DirectoryIndex in one site file cannot fix a request that is being served by another virtual host.

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Diagnose the symptom before changing configuration

1. Find the virtual host and DocumentRoot Apache is using

Do not assume the directory you edited is the one receiving the request. Ubuntu commonly has a default site enabled alongside one or more custom sites.

1. List the virtual hosts Apache has loaded:
   sudo apache2ctl -S
2. Note the host, port, configuration file, and the virtual host marked as the default for that address.
3. Open the matching site file, usually under /etc/apache2/sites-enabled/, and read its DocumentRoot value:
   sudo grep -R "DocumentRoot" /etc/apache2/sites-enabled/
4. Confirm that the host name in the browser matches the site’s ServerName or ServerAlias. A request made by an IP address can select a different site from a request made by a DNS name.
5. Check the effective configuration for syntax errors before reloading anything:
   sudo apache2ctl configtest
   The expected successful result is Syntax OK.

The path that matters is the active virtual host’s DocumentRoot. If it is /var/www/example/public, then Apache will look for /var/www/example/public/index.php, not for a file with the same name under /var/www/html.

2. Verify the exact index.php path, name, and permissions

Linux filenames are case-sensitive. Index.php, INDEX.PHP, and index.php are different files.

1. Set a shell variable to the document root you found, then inspect the file:
   DOCROOT=/var/www/example/public
sudo ls -l "$DOCROOT/index.php"
sudo stat "$DOCROOT/index.php"
2. If the file is absent, locate copies and move or deploy the intended one into the active root:
   sudo find /var/www -type f -name 'index.php' -print
3. Check each parent directory’s permissions. Apache needs execute (x) permission on every directory in the path and read permission on the file. A useful diagnostic is:
   namei -l "$DOCROOT/index.php"
4. Check ownership and the account used by Apache. Ubuntu’s service commonly runs as www-data, but use the User and Group values in Apache’s configuration as the authority. Avoid making the entire tree world-writable.

A typical static PHP file can be readable by its owner and group without being writable by the web server. Application-specific upload or cache directories may need separate write permissions; do not grant those permissions to the whole document root merely to make the index work.

3. Put index.php in the active DirectoryIndex list

When a browser requests a directory URL, Apache does not automatically prefer PHP. It checks the files named by DirectoryIndex, in order. Ubuntu’s documented default sequence includes index.html index.cgi index.pl index.php index.xhtml index.htm, but a site or distribution configuration can replace that list.

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1. Search the loaded configuration for every relevant declaration:
   sudo grep -R "^[[:space:]]*DirectoryIndex" /etc/apache2
2. In the intended virtual host or its <Directory> block, set the desired order. To make PHP the first choice:
   DirectoryIndex index.php index.html
3. If you want only the PHP entry point for an application, use:
   DirectoryIndex index.php
4. Validate and reload:
   sudo apache2ctl configtest
sudo systemctl reload apache2

Test both the directory URL and the file URL. https://example.test/ exercises DirectoryIndex; https://example.test/index.php bypasses index selection and tells you whether PHP execution itself works.

4. Choose one PHP integration method

Apache can execute PHP through the Apache module commonly packaged as libapache2-mod-php, or it can forward PHP requests to PHP-FPM through FastCGI. They are different process models and configuration paths.

Modern PHP documentation recommends PHP-FPM with Apache’s mod_proxy_fcgi for modern deployments. Whichever method you choose, remove or disable conflicting handlers and verify the actual installed version rather than copying a socket name from an unrelated example.

5. Repair a mod_php installation

Use this route when you intentionally want PHP loaded as an Apache module and your Ubuntu repositories provide the required package.

1. Install PHP and the Apache module:
   sudo apt update
sudo apt install php libapache2-mod-php
2. Inspect the enabled module files:
   ls -l /etc/apache2/mods-enabled/php*.load /etc/apache2/mods-enabled/php*.conf
   You should see a matching versioned .load and .conf file. If no matching files exist, list available modules under /etc/apache2/mods-available/.
3. Enable the installed version if necessary. Replace X.Y with the version shown by php -v and the filename in mods-available:
   sudo a2enmod phpX.Y
4. Check the configuration and restart Apache so the module is loaded:
   sudo apache2ctl configtest
sudo systemctl restart apache2
5. Confirm that the command-line PHP version and the enabled Apache module are intended to match. A different command-line version can exist on the same machine; the enabled Apache module is what handles web requests.

If Apache still sends the PHP source after a restart, inspect the response headers and error log. A missing SetHandler, a disabled module, or a competing configuration can leave .php treated as an ordinary text file.

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6. Configure PHP-FPM through FastCGI

FPM is a separate service. Installing it does not make Apache use it until the proxy integration and the correct endpoint are configured.

1. Identify the PHP version and installed FPM service:
   php -v
systemctl list-unit-files 'php*-fpm.service'
2. Install the FPM package for the intended version, if it is not already present. On Ubuntu the package name is versioned, for example php8.3-fpm; use the version available for your release rather than copying that example blindly.
3. Enable Apache’s proxy modules:
   sudo a2enmod proxy proxy_fcgi setenvif
4. Find the socket actually created by FPM:
   ls -l /run/php/
   Look for a file such as php8.3-fpm.sock. The number must match the running service.
5. Enable Ubuntu’s matching FPM Apache configuration when available. The configuration name is versioned, such as:
   sudo a2enconf php8.3-fpm
6. If you use a custom virtual-host configuration, attach PHP files to the real socket. This example must be edited to the installed version and path:
   <FilesMatch ".php$">
SetHandler "proxy:unix:/run/php/php8.3-fpm.sock|fcgi://localhost/"
</FilesMatch>
7. Start and enable the matching service, then validate and restart Apache:
   sudo systemctl enable --now php8.3-fpm
sudo apache2ctl configtest
sudo systemctl restart apache2

Use systemctl status php8.3-fpm with your actual version to check whether the service is running. If Apache reports a gateway error, do not guess a socket name: compare the configured path with /run/php/, then read both Apache’s error log and the FPM service log.

7. Make .htaccess rules take effect

Many PHP applications do not serve every route from a physical file. They rely on .htaccess to enable a front controller and rewrite requests to index.php. Apache’s AllowOverride setting determines whether those per-directory directives are read. With AllowOverride None, the file can exist and still have no effect.

1. Open the <Directory> block that covers the active document root. It may be in the virtual-host file or in a file under /etc/apache2/apache2.conf.
2. Set an override class appropriate to the application. A common starting point is:
   <Directory /var/www/example/public>
AllowOverride FileInfo Options
Require all granted
</Directory>
   Use the narrowest override permissions that support the application; AllowOverride All is broader than necessary for many sites.
3. Enable rewrite support if the application requires it:
   sudo a2enmod rewrite
4. Validate and restart Apache:
   sudo apache2ctl configtest
sudo systemctl restart apache2

If a rewrite rule causes a 500 response, temporarily rename .htaccess and retest the direct /index.php URL. Then restore the file and correct the specific directive shown in the error log. This separates PHP execution from routing problems.

8. Test PHP with a temporary probe, then remove it

Create a short-lived file in the active document root to prove that Apache is executing PHP, not merely finding the file:

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<?php
phpinfo();

Save it as phpinfo.php, request https://example.test/phpinfo.php, and check the page for the PHP version, loaded configuration file, Server API, and enabled extensions. A page showing PHP information confirms that a handler is active; it does not prove that your application’s framework or database configuration is correct.

Delete the probe immediately after testing:

sudo rm /var/www/example/public/phpinfo.php

The page exposes runtime paths, modules, environment details, and configuration values. Leaving it publicly accessible is an avoidable information disclosure.

9. Read the logs instead of guessing

Use a second terminal while making one request at a time. Ubuntu’s main Apache error log is commonly /var/log/apache2/error.log; a virtual host may also define its own ErrorLog and CustomLog.

• Watch the error log: sudo tail -f /var/log/apache2/error.log
• Find the site’s access log in its virtual-host configuration and watch it with sudo tail -f /path/to/access.log.
• Check service state and recent messages: sudo systemctl status apache2 and sudo journalctl -u apache2 -n 100 --no-pager.
• For FPM, use the matching unit, for example sudo journalctl -u php8.3-fpm -n 100 --no-pager.

Common repair scenarios

Apache shows index.html but you want index.php

Confirm that both files are under the active document root. Then place index.php before index.html in the effective DirectoryIndex list and reload Apache. If the result does not change, run apache2ctl -S again; you are probably editing a site that is not receiving the request.

A directory listing appears

Apache found the directory but none of the files in its index list. Verify the exact path and case of index.php, check its read permissions, and inspect any site-level DirectoryIndex override. If listings are not required, remove Indexes from the applicable Options directive rather than exposing filenames.

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The browser downloads PHP source

This is an execution-handler problem, not an index-order problem. Test /index.php directly, check for an enabled php*.load/php*.conf pair if using mod_php, or verify the FPM SetHandler and socket if using FPM. Restart Apache after changing the handler.

The site returns 403

Use namei -l to inspect every parent directory, confirm Apache’s service account can traverse the path, and read the exact denial in the error log. Also check the virtual host’s Require directives; filesystem permissions alone do not override Apache authorization rules.

The site returns 404 only for application routes

Request /index.php directly. If it works, PHP is probably healthy and the failure is routing. Check that .htaccess is present, AllowOverride permits its directives, and mod_rewrite is enabled. If the direct file also returns 404, return to the virtual-host and document-root checks.

The site returns 502 or 503 after switching to FPM

Check the FPM unit state, the socket filename under /run/php/, and the socket’s ownership and permissions. The Apache configuration and running FPM service must refer to the same PHP version. Logs normally identify whether the socket is missing, refused, or inaccessible.

Final verification checklist

• sudo apache2ctl -S identifies the intended virtual host.
• The active DocumentRoot contains the intended, correctly cased index.php.
• Apache can traverse parent directories and read the file.
• DirectoryIndex includes index.php in the desired order.
• Exactly one PHP path is intentional: mod_php or PHP-FPM.
• The selected handler’s module, service, socket, and PHP version agree.
• .htaccess is used only when the relevant AllowOverride permits its directives.
• mod_rewrite is enabled when front-controller routing needs it.
• apache2ctl configtest returns Syntax OK before a reload or restart.
• The temporary PHP information file has been deleted.
• The Apache access and error logs show the expected status for both / and /index.php.

Once these checks pass, Apache will either select index.php for the directory request or report a specific application-level error that can be fixed within PHP itself. The key is to diagnose the request path in order: virtual host, file, index selection, PHP handler, then rewrites.

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