For anyone still having trouble:
Remove any version of java you may have installed:
sudo apt-get remove java*
sudo apt-get remove openjdk*
sudo apt-get remove jre*
Then install OpenJDK 8:
sudo apt-get install openjdk-8-jdk
Lastly make sure you allow the launcher to be executable
cd /path/to/launcher
sudo chmod u+x DBLauncher.jar
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