I followed the above guidelines and it looks like JD has started.
Code:
pietrek@testujemy:~$ ps aux | grep JDownloader.jar
pietrek 914 21.0 4.1 3304924 85664 ? Sl 22:53 0:09 /usr/lib/jvm/jdk1.8.0_131/jre/bin/java -Djava.awt.headless=true -jar /home/pietrek/jd2/tmp/update/self/JDU/JDownloader.jar -selftest tmp/selftest_1500670420164 /home/pietrek/jd2
pietrek 953 0.0 0.0 15460 924 pts/0 S+ 22:54 0:00 grep --color=auto JDownloader.jar
There is something wrong with this launch because I can not connect through Web Interfaces:
https://my.jdownloader.org/
What could be wrong? How to modify it?