Installation of Apache OpenMeetings 6.1.0 on Debian 11 The present tutorial is made based on a minimal fresh installations of OpenMeetings 6.1.0 need Java 11 to work. So we install OpenJava 11: sudo apt install openjdk-11-jdk openjdk-11-jdk-headless sudo apt install -y imagemagick libjpeg62 zlib1g-dev We modify ImageMagick, so OpenMeetings can upload office files to whiteboard: sudo nano /etc/ImageMagick-6/policy.xml