$ sudo apt-get update
$ sudo apt-get install libopennebula-java 

libopennebula-java is installed in your system.

Make ensure the libopennebula-java package were installed using the commands given below,

$ sudo dpkg-query -l | grep libopennebula-java *

You will get with libopennebula-java package name, version, architecture and description in a table

libopennebula-java package basic information: