JDownloader will ONLY ask for MyJDownloader logins on console in headless mode (no X11 available)
You've got to repeat "java -jar JDownloader.jar -norestart" until installation is finished and JDownloader asks for logins on console.
Make sure the permissions/ownership is correct as you install into /opt/jdownloader
In doubt fix them via "sudo chown -R user:group /opt/jdownloader" and replace user and group with correct values.
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JD-Dev & Server-Admin
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