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Jigsaw is the Java standard module system released with JDK 9. The whole JDK 9 is reorganized with Jigsaw. That means after JDK 9, you will not find the huge “rt.jar” file in the JDK directory, instead a “$JDK_PATH/jmods” directory full of “*.jmob” files is introduced and all the files in it are the module files.
If you have a “mobi” format eBook file and want to convert it to “epub” format like me, you can use the software “Calibre” to do it, which is available on Linux/Mac/Windows.
For Ubuntu, run the following commands to install Calibre and convert the format.
There are also online services which can do the same thing like here. You can use such services if you don’t want to install a software to do it.