|In Windows 10 werkt Java niet in de browser Edge, omdat plug-ins in die browser niet worden ondersteund.|
Java is not installed by default in Ubuntu, but it can be installed as OpenJDK from the Ubuntu software center. Read OpenJDK vs Oracle first. sudo apt-get install default-jre.
It seems better to install LibreOffice through the Ubuntu software installer. Otherwise the integration with Java is not great. But then Java is needed for some spell checkers.