Update Server:<br /> apt update && apt upgrade -y<br /><br />Set hostname:<br /> hostnamectl set-hostname ex.example.com<br /><br />Add EGroupware APT Repository:<br /> sudo apt -y install gnupg<br /> wget -nv <a href="https://download.opensuse.org/repositories/server" target="_blank" rel="nofollow">https://download.opensuse.org/repositories/server</a>:eGroupWare/xUbuntu_20.04/Release.key -O - | sudo apt-key add -<br /> echo 'deb <a href="http://download.opensuse.org/repositories/server" target="_blank" rel="nofollow">http://download.opensuse.org/repositories/server</a>:/eGroupWare/xUbuntu_20.04/ /' | sudo tee /etc/apt/sources.list.d/server:eGroupWare.list<br /> sudo apt update<br /> sudo apt install egroupware-docker egroupware-collabora-key egroupware-rocketchat <br /> cat /var/lib/egroupware/egroupware-docker-install.log <br /> <br />Access UI:<br /> ex.example.com/egroupware<br />...<br /><a href="https://www.youtube.com/watch?v=MpB66vZjf8s" target="_blank" rel="nofollow">https://www.youtube.com/watch?v=MpB66vZjf8s</a>