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On Linux Lantern runs best on Oracle or Sun Java. Minimum Java version is 6. Make sure it has permision to write to the folder it's in in order for it to do things like save settings, log the users games go Pgn, and extract the opening book to disk which the user is prompted to allow Lantern to do when they first go to Options / Opening book
If double clicking or right clicking on jar produces no option to run, it can be run from the command line. Navigate in the console/terminal to the folder the lantern jar is in and first type there java -version to check that the user has Java and what version then type java -jar lantern###.jar to launch Lantern.