I have the same problem under fresh installation of Mango 3.3.0 on fresh Ubuntu 16.04 64 bit server. None of the above mentioned solution doesn't work for me. After that I decided to lower the version of the Oracle's JDK (it was jdk-9.0.4) to jdk1.8.0_162 and everything goes fine and smoothly. Maybe there is some incompatibility with the latest version of JDK?!