diff --git a/lib/os/class.ISPConfigDebianOS.inc.php b/lib/os/class.ISPConfigDebianOS.inc.php
index e5c8a5a97ad69c42f5e757c7a41bdf9043e1b899..3e9542ba00ffb32594929804573a43a4d4925868 100644
--- a/lib/os/class.ISPConfigDebianOS.inc.php
+++ b/lib/os/class.ISPConfigDebianOS.inc.php
@@ -157,8 +157,18 @@ class ISPConfigDebianOS extends ISPConfigBaseOS {
 		return $packages;
 	}
 
+	protected function getApacheModulesToDisable() {
+		$modules = array(
+			'mpm_prefork'
+		);
+		if(ISPConfig::wantsPHP() !== 'system') {
+			array_unshift($modules, 'php8.0');
+		}
+		return $modules;
+	}
+
 	protected function getApacheModulesToEnable() {
-		$modules = array('suexec', 'rewrite', 'ssl', 'actions', 'include', 'dav_fs', 'dav', 'auth_digest', 'cgi', 'headers', 'proxy_fcgi', 'alias');
+		$modules = array('suexec', 'rewrite', 'ssl', 'actions', 'include', 'dav_fs', 'dav', 'auth_digest', 'cgi', 'headers', 'proxy_fcgi', 'alias', 'http2', 'mpm_event');
 
 		return $modules;
 	}
@@ -774,7 +784,6 @@ mailman-unsubscribe:  "|/var/lib/mailman/mail/mailman unsubscribe mailman"';
 					'apache2-utils',
 					'libapache2-mod-fcgid',
 					'apache2-suexec-pristine',
-					'libapache2-mod-php',
 					'libapache2-mod-python',
 					'libapache2-mod-passenger'
 				);
@@ -799,6 +808,7 @@ mailman-unsubscribe:  "|/var/lib/mailman/mail/mailman unsubscribe mailman"';
 		if(ISPConfig::wantsPHP() === 'system') {
 			$php_versions = array($this->getSystemPHPVersion());
 		} else {
+			// If a new version is added, the getApacheModulesToDisable function should be updated to disable the latest version (this part could be improved)
 			$php_versions = array(
 				'5.6',
 				'7.0',
@@ -852,6 +862,15 @@ mailman-unsubscribe:  "|/var/lib/mailman/mail/mailman unsubscribe mailman"';
 		$this->installPackages($packages);
 
 		if(ISPConfig::shallInstall('web') && ISPConfig::$WEBSERVER === ISPC_WEBSERVER_APACHE) {
+			// Disable conflicting modules so mpm_event can be used with http2
+			ISPConfigLog::info('Disabling conflicting apache modules.', true);
+			$modules = $this->getApacheModulesToDisable();
+			$cmd = 'a2dismod ' . implode(' ', $modules) . ' 2>&1';
+			$result = $this->exec($cmd);
+			if($result === false) {
+				throw new ISPConfigOSException('Command ' . $cmd . ' failed.');
+			}
+
 			ISPConfigLog::info('Enabling apache modules.', true);
 			$modules = $this->getApacheModulesToEnable();
 			$cmd = 'a2enmod ' . implode(' ', $modules) . ' 2>&1';
@@ -859,6 +878,16 @@ mailman-unsubscribe:  "|/var/lib/mailman/mail/mailman unsubscribe mailman"';
 			if($result === false) {
 				throw new ISPConfigOSException('Command ' . $cmd . ' failed.');
 			}
+
+			ISPConfigLog::info('Enabling default PHP-FPM config.', true);
+			$conf = 'php' . $this->getSystemPHPVersion() . '-fpm';
+			$cmd = 'a2enconf ' . $conf . ' 2>&1';
+			$result = $this->exec($cmd);
+			if($result === false) {
+				throw new ISPConfigOSException('Command ' . $cmd . ' failed.');
+			}
+
+			$this->restartService('apache2');
 		}
 
 		try {