I have finally managed to get iReports working under Ubuntu 18.04. To start it I need to go to a command window, cd to /opt/iReports5.6.0/bin, and then type ./ireports. Why, I have no idea? If I type ireportes.exe in the bin directory it doesn't start. Regardless it took countless hours to get the correct version of java (1.7) to run instead of 1.8, which was a sticking issue. In Windows I would just create a shortcut to a batch file that would change the directory to /opt/iReports5.6.0/bin/ and then execute ./ireports. And I would then drop the shortcut onto the desktop.
Is there anything analagous in Ubuntu 18 world?