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+> 20.1 is still in a beta state, so make proper backup, before updating any essential installations
+
+## Major differences from a 19.1 installation
+
+* push server in an additional **egroupware-push** container, allowing instant updates without polling
+* new installations use MariaDB 10.4 in an additional **egroupware-db** container (19.1 updates keep using the database on the host)
+* new installations use Nginx as webserver/proxy on the host by default, unless you specify explicitly to use Apache2
+* modifications to docker-compose file are now kept in a separate docker-compose.override.yml to ease updates
+* EGroupware now uses TypeScript instead of plain JavaScript to ease client-side development
+
+### 20.1 packages are currently available only in a special repository
+The following example is for Ubuntu 20.04 (replace ```20.04``` with ```18.04``` or ```16.04```, or ```xUbuntu_20.04``` with ```Debian_10```):
+> For CentOS, RHEL, openSUSE or SLES [follow the 19.1 instructions](https://github.com/EGroupware/egroupware/wiki/19.1-Release-notes-and-distribution-specific-instructions/_edit#opensuse-151--150-or-sles-15--12) replacing ```server:eGroupWare``` with ```server:eGroupWare:/trunk``` in the repository
+
+```
+sudo sh -c "echo 'deb http://download.opensuse.org/repositories/server:/eGroupWare:/trunk/xUbuntu_20.04/ /' > /etc/apt/sources.list.d/server:eGroupWare:trunk.list"
+
+sudo apt-get install gnupg # required for Debian 10 to use apt-key add
+
+wget -nv https://download.opensuse.org/repositories/server:eGroupWare:/trunk/xUbuntu_20.04/Release.key -O - | \
+   sudo apt-key add -
+
+apt update
+```
+
+### To upgrade in place from 19.1
+```
+apt upgrade
+```
+> Use the default to NOT replace config-files, if you are asked. The update script takes care of all necessary changes!
+
+### For a new 20.1 installation
+``` 
+apt install egroupware-docker
+```
+> If you prefer to use Apache2 on the host as proxy, add ```apache2``` to the above install command.
+
+It will create (or update) the following files in /etc/egroupware-docker:
+* **nginx.conf** config for using Nginx as proxy on the host, symlinked to /etc/nginx/conf.d/egroupware.conf
+* **apache.conf** config for using Apache2 on the host, symlinked to /etc/apache2/sites-{enabled,avalable}/egroupware.conf
+* **docker-compose.override.yml** for local modifications with many commented out examples (contains your 19.1 docker-compose.yml in case of an update!)
+* **.env** contains root password of MariaDB container
+* **mariadb.cnf** file to overfide MariaDB configuration in the container
+* **docker-compose.yml**, **latest-*.yml** or **create-override.sh** **do NOT modify!** 
+* **use-epl.sh** script to update to EPL (EGroupware GmbH subscription version)
+* **egroupware-logs.sh** tail EGroupware's error-log
+
+> This currently brief information will receive more updates in the next weeks. In the meantime most of the 19.1 documentation is valid for 20.1 too.
+