diff --git a/php/src/Controller/DockerController.php b/php/src/Controller/DockerController.php
index 9c0a1ffc99f..027832e5472 100644
--- a/php/src/Controller/DockerController.php
+++ b/php/src/Controller/DockerController.php
@@ -108,7 +108,6 @@ public function StartContainer(Request $request, Response $response, $args) : Re
         // set AIO_TOKEN
         $config['AIO_TOKEN'] = bin2hex(random_bytes(24));
         $this->configurationManager->WriteConfig($config);
-        $this->configurationManager->SetIsContainerUpateAvailable(false);
 
         // Stop domaincheck since apache would not be able to start otherwise
         $this->StopDomaincheckContainer();
diff --git a/php/src/Data/ConfigurationManager.php b/php/src/Data/ConfigurationManager.php
index f368a564dd9..f772988b9e7 100644
--- a/php/src/Data/ConfigurationManager.php
+++ b/php/src/Data/ConfigurationManager.php
@@ -30,16 +30,6 @@ public function GetToken() : string {
         return $this->GetConfig()['AIO_TOKEN'];
     }
 
-    public function GetIsContainerUpateAvailable() : bool {
-        return isset($this->GetConfig()['isContainerUpateAvailable']) ? $this->GetConfig()['isContainerUpateAvailable'] : false;
-    }
-
-    public function SetIsContainerUpateAvailable(bool $value) : void {
-        $config = $this->GetConfig();
-        $config['isContainerUpateAvailable'] = $value;
-        $this->WriteConfig($config);
-    }
-
     public function SetPassword(string $password) : void {
         $config = $this->GetConfig();
         $config['username'] = 'admin';
diff --git a/php/src/Docker/DockerActionManager.php b/php/src/Docker/DockerActionManager.php
index 9622fe1c577..9a424108a14 100644
--- a/php/src/Docker/DockerActionManager.php
+++ b/php/src/Docker/DockerActionManager.php
@@ -290,12 +290,8 @@ private function isContainerUpdateAvailable(string $id) : string
     public function isAnyUpdateAvailable() {
         $id = 'nextcloud-aio-apache';
 
-        if ($this->configurationManager->GetIsContainerUpateAvailable()) {
-            return true;
-        }
 
         if ($this->isContainerUpdateAvailable($id) !== "") {
-            $this->configurationManager->SetIsContainerUpateAvailable(true);
             return true;
         } else {
             return false;
diff --git a/readme.md b/readme.md
index 011cc1cea62..17474e53f84 100644
--- a/readme.md
+++ b/readme.md
@@ -16,10 +16,21 @@ Included are:
 
 ## How to use this?
 1. Install Docker on your Linux installations using:
+
 ```
 curl -fsSL get.docker.com | sudo sh
 ```
-2. Run the following command:
+2. Make sure that the docker group has the correct groupid:
+
+```
+sudo groupmod -g 998 docker
+```
+3. Make sure to pull the latest image:
+
+```
+sudo docker pull nextcloud/all-in-one:latest
+```
+4. Run the following command in order to start the container:
 
 ```
 sudo docker run -it \
@@ -32,13 +43,19 @@ sudo docker run -it \
 --volume /var/run/docker.sock:/var/run/docker.sock:ro \
 nextcloud/all-in-one:latest
 ```
-3. After the initial startup, you should be able to open the Nextcloud AIO Interface now on port 8080 of this server.<br>
+5. After the initial startup, you should be able to open the Nextcloud AIO Interface now on port 8080 of this server.<br>
 E.g. https://internal.ip.of.this.server:8080<br>
 If your server has port 80 and 8443 open and you point a domain to your server, you can get a valid certificate automatially by opening the Nextcloud AIO Interface via:<br>
 https://your-domain-that-points-to-this-server.tld:8443
 
-Explanation of used ports:
+### Which ports are mandatory to be open?
+Only those (if you acces the Mastercontainer Interface internally via port 8080):
+- `443/TCP` for the Nextcloud container
+- `3478/TCP` and `3478/UPD` for the Talk container
 
-- `80`: redirects to Nextcloud (HTTP) (is used for getting the certificate via ACME http-challenge for mastercontainer)
-- `8080`: Master Container Interface with self-signed certificate (HTTPS) (works always, also if only access via IP-address is possible, e.g. `https://internal.ip.address:8080/`)
-- `8443`: Master Container Interface with valid automatic certificate via Let's Encrypt! (HTTPS) (Only works if you access the container via a public domain, e.g. `https://public.domain.com:8443/` and not via IP-address.)
+### Explanation of used ports:
+- `8080/TCP`: Mastercontainer Interface with self-signed certificate (works always, also if only access via IP-address is possible, e.g. `https://internal.ip.address:8080/`)
+- `80/TCP`: redirects to Nextcloud (is used for getting the certificate via ACME http-challenge for the Mastercontainer)
+- `8443/TCP`: Mastercontainer Interface with valid certificate (only works if port 80 and 8443 are open and you point a domain to your server. It generates a valid certificate then automatically and access via e.g. `https://public.domain.com:8443/` is possible.)
+- `443/TCP`: will be used by the Nextcloud container later on and needs to be open
+- `3478/TCP` and `3478/UPD`: will be used by the Turnserver inside the Talk container and needs to be open