diff --git a/install/dist/lib/gentoo.lib.php b/install/dist/lib/gentoo.lib.php
index 8c942f249139f4182af1fce0607229161cb3adaf..ef660d950d6c8a2a483efaccca5a2d511f9fa0ef 100644
--- a/install/dist/lib/gentoo.lib.php
+++ b/install/dist/lib/gentoo.lib.php
@@ -942,7 +942,8 @@ class installer extends installer_base
 				caselog($command.' &> /dev/null 2> /dev/null', __FILE__, __LINE__, "EXECUTED: $command", "Failed to execute the command $command");
 			}
 
-			$command = 'adduser '.$conf['apache']['user'].' '.$apps_vhost_group;
+			//$command = 'adduser '.$conf['apache']['user'].' '.$apps_vhost_group;
+      $command = 'usermod -a -G '.$apps_vhost_group.' '.$conf['apache']['user'];
 			caselog($command.' &> /dev/null', __FILE__, __LINE__, "EXECUTED: $command", "Failed to execute the command $command");
 
 			if(!@is_dir($install_dir)){
@@ -1002,7 +1003,8 @@ class installer extends installer_base
 			if(!is_user($apps_vhost_user)) caselog($command.' &> /dev/null 2> /dev/null', __FILE__, __LINE__, "EXECUTED: $command", "Failed to execute the command $command");
 
 
-			$command = 'adduser '.$conf['nginx']['user'].' '.$apps_vhost_group;
+			//$command = 'adduser '.$conf['nginx']['user'].' '.$apps_vhost_group;
+      $command = 'usermod -a -G '.$apps_vhost_group.' '.$conf['nginx']['user'];
 			caselog($command.' &> /dev/null', __FILE__, __LINE__, "EXECUTED: $command", "Failed to execute the command $command");
 
 			if(!@is_dir($install_dir)){
@@ -1362,18 +1364,18 @@ class installer extends installer_base
 		// and must be fixed as this will allow the apache user to read the ispconfig files.
 		// Later this must run as own apache server or via suexec!
 		if($conf['apache']['installed'] == true){
-			$command = 'adduser '.$conf['apache']['user'].' ispconfig';
+			$command = 'usermod -a -G ispconfig '.$conf['apache']['user'];
 			caselog($command.' &> /dev/null', __FILE__, __LINE__, "EXECUTED: $command", "Failed to execute the command $command");
 			if(is_group('ispapps')){
-				$command = 'adduser '.$conf['apache']['user'].' ispapps';
+        $command = 'usermod -a -G ispapps '.$conf['apache']['user'];
 				caselog($command.' &> /dev/null', __FILE__, __LINE__, "EXECUTED: $command", "Failed to execute the command $command");
 			}
 		}
 		if($conf['nginx']['installed'] == true){
-			$command = 'adduser '.$conf['nginx']['user'].' ispconfig';
+      $command = 'usermod -a -G ispconfig '.$conf['nginx']['user'];
 			caselog($command.' &> /dev/null', __FILE__, __LINE__, "EXECUTED: $command", "Failed to execute the command $command");
 			if(is_group('ispapps')){
-				$command = 'adduser '.$conf['nginx']['user'].' ispapps';
+        $command = 'usermod -a -G ispapps '.$conf['nginx']['user'];
 				caselog($command.' &> /dev/null', __FILE__, __LINE__, "EXECUTED: $command", "Failed to execute the command $command");
 			}
 		}
@@ -1597,3 +1599,4 @@ class installer extends installer_base
 }
 
 ?>
+