Hello team, due to some reason I have uninstalled the gluu server. After uninstall, when I tried to install the following error is encountered: Failed to start gluu-server-3.1.3.service: Unit gluu-server-3.1.3.service not found. I tried the following steps mentioned at gluu.org 1. Add Gluu Repository # echo "deb https://repo.gluu.org/ubuntu/ xenial main" > /etc/apt/sources.list.d/gluu-repo.list 2. Add Gluu GPG Key # curl https://repo.gluu.org/ubuntu/gluu-apt.key | apt-key add - 3. Update/Clean Repo # apt-get update 4. Install Gluu Server # apt-get install gluu-server-3.1.3 I have done all the steps but it is still show the error as "Failed to start gluu-server-3.1.3.service: Unit gluu-server-3.1.3.service not found."